初一数学二元一次方程和三元一次方程计算题,要答案,要对,一共50道

最好一些简单,一些难
2025-02-23 05:25:10
推荐回答(3个)
回答1:

1.二元一次方程4x-3y=12,当x=0,1,2,3时,y=______. 

2.在x+3y=3中,若用x表示y,则y=______,用y表示x,则x=______. 

4.把方程3(x+5)=5(y-1)+3化成二元一次方程的一般形式为______. 

(1)方程y=2x-3的解有______; 

(2)方程3x+2y=1的解有______; 

(3)方程y=2x-3与3x+2y=1的公共解是______. 

9.方程x+y=3有______组解,有______组正整数解,它们是______. 

11.已知方程(k2-1)x2+(k+1)x+(k-7)y=k+2.当k=______时,方程为一元一次方程;当k=______时,方程为二元一次方程. 

12.对二元一次方程2(5-x)-3(y-2)=10,当x=0时,则y=______;当y=0时,则x=______. 

13.方程2x+y=5的正整数解是______. 

14.若(4x-3)2+|2y+1|=0,则x+2=______. 

的解. 

当k为______时,方程组没有解. 

______. 

(二)选择 

24.在方程2(x+y)-3(y-x)=3中,用含x的代数式表示y,则[ ] 

A.y=5x-3; 

B.y=-x-3; 

D.y=-5x-3. 

[ ] 

26.与已知二元一次方程5x-y=2组成的方程组有无数多个解的方程是[ ] 

A.10x+2y=4; 

B.4x-y=7; 

C.20x-4y=3; 

D.15x-3y=6. 

[ ] 

A.m=9; 

B.m=6; 

C.m=-6; 

D.m=-9. 

28.若5x2ym与4xn+m-1y是同类项,则m2-n的值为 [ ] 

A.1; 

B.-1; 

C.-3; 

D.以上答案都不对. 

29.方程2x+y=9在正整数范围内的解有[ ] 

A.1个; 

B.2个; 

C.3个; 

D.4个. 

[ ] 

A.4; 

B.2; 

C.-4; 

D.以上答案都不对. 
二元一次方程组•综合创新练习题 
一、综合题 

【Z,3,二】 

【Z,3,二】 
3.已知4ax+yb2与-a3by是同类项求2x-y的值. 
【Z,3,二】 
4.若|x-2|+(2x-3y+5)2=0,求x和y的值. 
【N,3,三】 
5.若方程2x2m+3+3y5n-4=7是x,y的二元一次方程组,求m2+n的值. 
【Z,3,二】 
二、创新题 
1.已知x和y互为相反数,且(x+y+4)(x-y)=4,求x和y的值. 
【N,4,三】 
2.求方程x+2y=7在自然数范围内的解. 
【N,4,三】 
三、中考题 
(山东,95,3分)下列结论正确的是 
[ ] 

参考答案及点拨 

一、1.所考知识点:方程组的解及求代数式的值. 

∴ 2m+3n=2×2+3(-3)=4-9=-5. 
2.所考知识点:方程的解及解一元一次方程. 
解:把 x=-3,y=-2代入方程,得 2(-3)-4(-2)+2a=3解关 

点拨:以上两题考察的知识点类似,已知方程的解时,只要把这组数代入方程或方程组就可求出方程中其他字母的值. 
3.所考知识点:同类项及解方程 

点拨:根据同类项的定义知,相同字母的指数相同,故可列出方程,从而求解. 
4.所考知识点:非负数的性质及解简单的二元一次方程组. 

点拨:因|x-2|≥0,(2x-3y+5)2≥0,所以,当它们的和为零,这两个数都须是零,即x-2=0,2x-3y+5=0. 
5.所考知识点:二元一次方程的定义. 
解:由题意知 

点拨:从二元一次方程的定义知,未知项的指数为 1,由此得到 2m+3=1, 5n-4=1. 
二、1.所考知识点:相反数的意义及解简单的二元一次方程组. 
解:由题意,得x+y=0, 
又∵(x+y+4)(x-y)=4 
∴ 4(x-y)=4 
即x-y=1 

2.所考知识点:二元一次方程的自然数解. 
解:把方程x+2y=7变形,得x=7-2y 
令y=1,2,3,4……,则x=5,3,1,-1
1) 66x+17y=3967 
25x+y=1200 
答案:x=48 y=47 
(2) 18x+23y=2303 
74x-y=1998 
答案:x=27 y=79 
(3) 44x+90y=7796 
44x+y=3476 
答案:x=79 y=48 
(4) 76x-66y=4082 
30x-y=2940 
答案:x=98 y=51 
(5) 67x+54y=8546 
71x-y=5680 
答案:x=80 y=59 
(6) 42x-95y=-1410 
21x-y=1575 
答案:x=75 y=48 
(7) 47x-40y=853 
34x-y=2006 
答案:x=59 y=48 
(8) 19x-32y=-1786 
75x+y=4950 
答案:x=66 y=95 
(9) 97x+24y=7202 
58x-y=2900 
答案:x=50 y=98 
(10) 42x+85y=6362 
63x-y=1638 
答案:x=26 y=62 
(11) 85x-92y=-2518 
27x-y=486 
答案:x=18 y=44 
(12) 79x+40y=2419 
56x-y=1176 
答案:x=21 y=19 
(13) 80x-87y=2156 
22x-y=880 
答案:x=40 y=12 
(14) 32x+62y=5134 
57x+y=2850 
答案:x=50 y=57 
(15) 83x-49y=82 
59x+y=2183 
答案:x=37 y=61 
(16) 91x+70y=5845 
95x-y=4275 
答案:x=45 y=25 
(17) 29x+44y=5281 
88x-y=3608 
答案:x=41 y=93 
(18) 25x-95y=-4355 
40x-y=2000 
答案:x=50 y=59 
(19) 54x+68y=3284 
78x+y=1404 
答案:x=18 y=34 
(20) 70x+13y=3520 
52x+y=2132 
答案:x=41 y=50 
(21) 48x-54y=-3186 
24x+y=1080 
答案:x=45 y=99 
(22) 36x+77y=7619 
47x-y=799 
答案:x=17 y=91 
(23) 13x-42y=-2717 
31x-y=1333 
答案:x=43 y=78 
(24) 28x+28y=3332 
52x-y=4628 
答案:x=89 y=30 
(25) 62x-98y=-2564 
46x-y=2024 
答案:x=44 y=54 
(26) 79x-76y=-4388 
26x-y=832 
答案:x=32 y=91 
(27) 63x-40y=-821 
42x-y=546 
答案:x=13 y=41 
(28) 69x-96y=-1209 
42x+y=3822 
答案:x=91 y=78 
(29) 85x+67y=7338 
11x+y=308 
答案:x=28 y=74 
(30) 78x+74y=12928 
14x+y=1218 
答案:x=87 y=83 
(31) 39x+42y=5331 
59x-y=5841 
答案:x=99 y=35 
(32) 29x+18y=1916 
58x+y=2320 
答案:x=40 y=42 
(33) 40x+31y=6043 
45x-y=3555 
答案:x=79 y=93 
(34) 47x+50y=8598 
45x+y=3780 
答案:x=84 y=93 
(35) 45x-30y=-1455 
29x-y=725 
答案:x=25 y=86 
(36) 11x-43y=-1361 
47x+y=799 
答案:x=17 y=36 
(37) 33x+59y=3254 
94x+y=1034 
答案:x=11 y=49 
(38) 89x-74y=-2735 
68x+y=1020 
答案:x=15 y=55 
(39) 94x+71y=7517 
78x+y=3822 
答案:x=49 y=41 
(40) 28x-62y=-4934 
46x+y=552 
答案:x=12 y=85 
(41) 75x+43y=8472 
17x-y=1394 
答案:x=82 y=54 
(42) 41x-38y=-1180 
29x+y=1450 
答案:x=50 y=85 
(43) 22x-59y=824 
63x+y=4725 
答案:x=75 y=14 
(44) 95x-56y=-401 
90x+y=1530 
答案:x=17 y=36 
(45) 93x-52y=-852 
29x+y=464 
答案:x=16 y=45 
(46) 93x+12y=8823 
54x+y=4914 
答案:x=91 y=30 
(47) 21x-63y=84 
20x+y=1880 
答案:x=94 y=30 
(48) 48x+93y=9756 
38x-y=950 
答案:x=25 y=92 
(49) 99x-67y=4011 
75x-y=5475 
答案:x=73 y=48 
(50) 83x+64y=9291 
90x-y=3690 
答案:x=41 y=92 

(51) 17x+62y=3216 
75x-y=7350 
答案:x=98 y=25 
(52) 77x+67y=2739 
14x-y=364 
答案:x=26 y=11 
(53) 20x-68y=-4596 
14x-y=924 
答案:x=66 y=87 
(54) 23x+87y=4110 
83x-y=5727 
答案:x=69 y=29 
(55) 22x-38y=804 
86x+y=6708 
答案:x=78 y=24 
(56) 20x-45y=-3520 
56x+y=728 
答案:x=13 y=84 
(57) 46x+37y=7085 
61x-y=4636 
答案:x=76 y=97 
(58) 17x+61y=4088 
71x+y=5609 
答案:x=79 y=45 
(59) 51x-61y=-1907 
89x-y=2314 
答案:x=26 y=53 
(60) 69x-98y=-2404 
21x+y=1386 
答案:x=66 y=71 
(61) 15x-41y=754 
74x-y=6956 
答案:x=94 y=16 
(62) 78x-55y=656 
89x+y=5518 
答案:x=62 y=76 
(63) 29x+21y=1633 
31x-y=713 
答案:x=23 y=46 
(64) 58x-28y=2724 
35x+y=3080 
答案:x=88 y=85 
(65) 28x-63y=-2254 
88x-y=2024 
答案:x=23 y=46 
(66) 43x+50y=7064 
85x+y=8330 
答案:x=98 y=57 
(67) 58x-77y=1170 
38x-y=2280 
答案:x=60 y=30 
(68) 92x+83y=11586 
43x+y=3010 
答案:x=70 y=62 
(69) 99x+82y=6055 
52x-y=1716 
答案:x=33 y=34 
(70) 15x+26y=1729 
94x+y=8554 
答案:x=91 y=14 
(71) 64x+32y=3552 
56x-y=2296 
答案:x=41 y=29 
(72) 94x+66y=10524 
84x-y=7812 
答案:x=93 y=27 
(73) 65x-79y=-5815 
89x+y=2314 
答案:x=26 y=95 
(74) 96x+54y=6216 
63x-y=1953 
答案:x=31 y=60 
(75) 60x-44y=-352 
33x-y=1452 
答案:x=44 y=68 
(76) 79x-45y=510 
14x-y=840 
答案:x=60 y=94 
(77) 29x-35y=-218 
59x-y=4897 
答案:x=83 y=75 
(78) 33x-24y=1905 
30x+y=2670 
答案:x=89 y=43 
(79) 61x+94y=11800 
93x+y=5952 
答案:x=64 y=84 
(80) 61x+90y=5001 
48x+y=2448 
答案:x=51 y=21 
(81) 93x-19y=2 
86x-y=1548 
答案:x=18 y=88 
(82) 19x-96y=-5910 
30x-y=2340 
答案:x=78 y=77 
(83) 80x+74y=8088 
96x-y=8640 
答案:x=90 y=12 
(84) 53x-94y=1946 
45x+y=2610 
答案:x=58 y=12 
(85) 93x+12y=9117 
28x-y=2492 
答案:x=89 y=70 
(86) 66x-71y=-1673 
99x-y=7821 
答案:x=79 y=97 
(87) 43x-52y=-1742 
76x+y=1976 
答案:x=26 y=55 
(88) 70x+35y=8295 
40x+y=2920 
答案:x=73 y=91 
(89) 43x+82y=4757 
11x+y=231 
答案:x=21 y=47 
(90) 12x-19y=236 
95x-y=7885 
答案:x=83 y=40 
(91) 51x+99y=8031 
71x-y=2911 
答案:x=41 y=60 
(92) 37x+74y=4403 
69x-y=6003 
答案:x=87 y=16 
(93) 46x+34y=4820 
71x-y=5183 
答案:x=73 y=43 
(94) 47x+98y=5861 
55x-y=4565 
答案:x=83 y=20 
(95) 30x-17y=239 
28x+y=1064 
答案:x=38 y=53 
(96) 55x-12y=4112 
79x-y=7268 
答案:x=92 y=79 
(97) 27x-24y=-450 
67x-y=3886 
答案:x=58 y=84 
(98) 97x+23y=8119 
14x+y=966 
答案:x=69 y=62 
(99) 84x+53y=11275 
70x+y=6790 
答案:x=97 y=59 
(100) 51x-97y=297 
19x-y=1520 
答案:x=80 y=39  
1.2x+7y-z=24 ① 
4x-4y+z=-3 ② 
x+y=5 ③ 

解:由①+②得:2x+7y-z+4x-4y+z=24-3 
6x+3y=21 ④ 

得:6x+3y=21 ④ 
x+y=5 ③ 
解:由③得x=5-y ⑤ 
把⑤代入④中 
30-6y+3y=21 
-3y=-9 
y=3 

因此:x=2 
y=3 
z=1 
2.一元二次方程单元复习 

一、选择题:(每小题2分,共20分) 
1.下列方程中不一定是一元二次方程的是( ) 
A.(a-3)x2=8(a≠0) B.ax2+bx+c=0 
C.(x+3)(x-2)=x+5 D. 
2.已知一元二次方程ax2+c=0(a≠0),若方程有解,则必须有C等于( ) 
A.- B.-1 C. D.不能确定 
3.若关于x的方程ax2+2(a-b)x+(b-a)=0有两个相等的实数根,则a:b等于( ) 
A.-1或2 B.1或 C.- 或1 D.-2或1 
4.若关于y的一元二次方程ky2-4y-3=3y+4有实根,则k的取值范围是( ) 
A.k>- B.k≥- 且k≠0 C.k≥- D.k> 且k≠0 
5.已知方程 的两根分别为a, ,则方程 的根是( ) 
A. B. C. D. 
6.关于x的方程x2+2(k+2)x+k2=0的两个实数根之和大于-4,则k的取值范围是( ) 
A.k>-1 B.k<0 C.-17.若方程x2-kx+6=0的两个实数根分别比方程x2+kx+6=0的两个实数根大5,则k的值为( ) 
A.2 B. C.5 D.-5 
8.使分式 的值等于零的x是( ) 
A.6 B.-1或6 C.-1 D.-6 
9.方程x2-4│x│+3=0的解是( ) 
A.x=±1或x=±3 B.x=1和x=3 C.x=-1或x=-3 D.无实数根 
10.如果关于x的方程x2-k2-16=0和x2-3k+12=0有相同的实数根,那么k的值是( ) 
A.-7 B.-7或4 C.-4 D.4 

二、填空题:(每小题3分,共30分) 
11.已知3- 是方程x2+mx+7=0的一个根,则m=____________,另一根为____________. 
12.已知方程3ax2-bx-1=0和ax2+2bx-5=0,有共同的根-1,则a=____________,b=____________. 
13.若一元二次方程ax2+bx+c=0(a≠0)有一个根为1,则a+b+c=____________;若有一个根为-1,则b 与a、c之间的关系为____________;若有一个根为零,则c=____________. 
14.若方程2x2-8x+7=0的两根恰好是一个直角三角形两条直角边的长,则这个直角三角形的斜边长是___________. 
15.一元二次方程x2-3x-1=0与x2-x+3=0的所有实数根的和等于________________. 
16.某食品连续两次涨价10%后价格是a元,那么原价是_____________________. 
17.已知两数的积是12,这两数的平方和是25,以这两数为根的一元二次方程是___________. 
18.如果关于x的方程x2-2(1-k)+k2=0有实数根α,β,那么α+β的取值范围是_______. 
19.设A是方程x2- x-520=0的所有根的绝对值之和,则A2=________. 
20.长方形铁片四角各截去一个边长为5cm的正方形,而后折起来做一个没盖的盒子,铁片的长是宽的2倍,作成的盒子容积为1.5 立方分米,则铁片的长等于________,宽等于________. 
1。 4x+y-z=12  3x+2y+z=-5  x-y+5z=1
2。 2a+7b=3  3a-c=1  -b+3c=4
3。 x:y=3:2  y:Z=5:4  x+y+z=66
4。 a-d=-4  d-2y=-1  a+s-d=-1
5。 a=6s  a-4=10s-20d  a+12=3y+18d
6。 a+s=8  a+d=6  s+d=10
7。 3(a+s-d)=15(d-a)  5(a+s-d)=400  15+53/6(a+s)=10000
8。 2a+s+d=15  a+2s+d=16  a+s+2d=17
9。 2a=3s=6d  a+2s+d=16
10。 A:S:D=3:4:5  A+S+D=36

回答2:

1) 66x+17y=3967
25x+y=1200
答案:x=48 y=47
(2) 18x+23y=2303
74x-y=1998
答案:x=27 y=79
(3) 44x+90y=7796
44x+y=3476
答案:x=79 y=48
(4) 76x-66y=4082
30x-y=2940
答案:x=98 y=51
(5) 67x+54y=8546
71x-y=5680
答案:x=80 y=59
(6) 42x-95y=-1410
21x-y=1575
答案:x=75 y=48
(7) 47x-40y=853
34x-y=2006
答案:x=59 y=48
(8) 19x-32y=-1786
75x+y=4950
答案:x=66 y=95
(9) 97x+24y=7202
58x-y=2900
答案:x=50 y=98
(10) 42x+85y=6362
63x-y=1638
答案:x=26 y=62
(11) 85x-92y=-2518
27x-y=486
答案:x=18 y=44
(12) 79x+40y=2419
56x-y=1176
答案:x=21 y=19
(13) 80x-87y=2156
22x-y=880
答案:x=40 y=12
(14) 32x+62y=5134
57x+y=2850
答案:x=50 y=57
(15) 83x-49y=82
59x+y=2183
答案:x=37 y=61
(16) 91x+70y=5845
95x-y=4275
答案:x=45 y=25
(17) 29x+44y=5281
88x-y=3608
答案:x=41 y=93
(18) 25x-95y=-4355
40x-y=2000
答案:x=50 y=59
(19) 54x+68y=3284
78x+y=1404
答案:x=18 y=34
(20) 70x+13y=3520
52x+y=2132
答案:x=41 y=50
(21) 48x-54y=-3186
24x+y=1080
答案:x=45 y=99
(22) 36x+77y=7619
47x-y=799
答案:x=17 y=91
(23) 13x-42y=-2717
31x-y=1333
答案:x=43 y=78
(24) 28x+28y=3332
52x-y=4628
答案:x=89 y=30
(25) 62x-98y=-2564
46x-y=2024
答案:x=44 y=54
(26) 79x-76y=-4388
26x-y=832
答案:x=32 y=91
(27) 63x-40y=-821
42x-y=546
答案:x=13 y=41
(28) 69x-96y=-1209
42x+y=3822
答案:x=91 y=78
(29) 85x+67y=7338
11x+y=308
答案:x=28 y=74
(30) 78x+74y=12928
14x+y=1218
答案:x=87 y=83
(31) 39x+42y=5331
59x-y=5841
答案:x=99 y=35
(32) 29x+18y=1916
58x+y=2320
答案:x=40 y=42
(33) 40x+31y=6043
45x-y=3555
答案:x=79 y=93
(34) 47x+50y=8598
45x+y=3780
答案:x=84 y=93
(35) 45x-30y=-1455
29x-y=725
答案:x=25 y=86
(36) 11x-43y=-1361
47x+y=799
答案:x=17 y=36
(37) 33x+59y=3254
94x+y=1034
答案:x=11 y=49
(38) 89x-74y=-2735
68x+y=1020
答案:x=15 y=55
(39) 94x+71y=7517
78x+y=3822
答案:x=49 y=41
(40) 28x-62y=-4934
46x+y=552
答案:x=12 y=85
(41) 75x+43y=8472
17x-y=1394
答案:x=82 y=54
(42) 41x-38y=-1180
29x+y=1450
答案:x=50 y=85
(43) 22x-59y=824
63x+y=4725
答案:x=75 y=14
(44) 95x-56y=-401
90x+y=1530
答案:x=17 y=36
(45) 93x-52y=-852
29x+y=464
答案:x=16 y=45
(46) 93x+12y=8823
54x+y=4914
答案:x=91 y=30
(47) 21x-63y=84
20x+y=1880
答案:x=94 y=30
(48) 48x+93y=9756
38x-y=950
答案:x=25 y=92
(49) 99x-67y=4011
75x-y=5475
答案:x=73 y=48
(50) 83x+64y=9291
90x-y=3690
答案:x=41 y=92

回答3:

给你推荐好方法,去求解答输入你要找的关键词,就什么题都有了,比在这问大家效率高哇,试试吧

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