20道解方程并有解题步骤!! 纯计算!!解题步骤清楚!!快呀!!

2025-02-15 05:09:51
推荐回答(2个)
回答1:

一、选择题:1.下列方程中,是二元一次方程的是( ) A.3x-2y=4z B.6xy+9=0 C. +4y=6 D.4x= 2.下列方程组中,是二元一次方程组的是( ) A. 3.二元一次方程5a-11b=21 ( ) A.有且只有一解 B.有无数解 C.无解 D.有且只有两解4.方程y=1-x与3x+2y=5的公共解是( ) A. 5.若│x-2│+(3y+2)2=0,则的值是( ) A.-1 B.-2 C.-3 D. 6.方程组 的解与x与y的值相等,则k等于( )7.下列各式,属于二元一次方程的个数有( ) ①xy+2x-y=7; ②4x+1=x-y; ③ +y=5; ④x=y; ⑤x2-y2=2 ⑥6x-2y ⑦x+y+z=1 ⑧y(y-1)=2y2-y2+x A.1 B.2 C.3 D.48.某年级学生共有246人,其中男生人数y比女生人数x的2倍少2人,则下面所列的方程组中符合题意的有( ) A. 二、填空题9.已知方程2x+3y-4=0,用含x的代数式表示y为:y=_______;用含y的代数式表示x为:x=________.10.在二元一次方程- x+3y=2中,当x=4时,y=_______;当y=-1时,x=______.11.若x3m-3-2yn-1=5是二元一次方程,则m=_____,n=______.12.已知 是方程x-ky=1的解,那么k=_______.13.已知│x-1│+(2y+1)2=0,且2x-ky=4,则k=_____.14.二元一次方程x+y=5的正整数解有______________.15.以 为解的一个二元一次方程是_________.16.已知 的解,则m=_______,n=______. 三、解答题17.当y=-3时,二元一次方程3x+5y=-3和3y-2ax=a+2(关于x,y的方程)有相同的解,求a的值. 18.如果(a-2)x+(b+1)y=13是关于x,y的二元一次方程,则a,b满足什么条件? 19.二元一次方程组 的解x,y的值相等,求k. 20.已知x,y是有理数,且(│x│-1)2+(2y+1)2=0,则x-y的值是多少? 21.已知方程 x+3y=5,请你写出一个二元一次方程,使它与已知方程所组成的方程组的解为 . 22.根据题意列出方程组:(1)明明到邮局买0.8元与2元的邮票共13枚,共花去20元钱,问明明两种邮票各买了多少枚? (2)将若干只鸡放入若干笼中,若每个笼中放4只,则有一鸡无笼可放;若每个笼里放5只,则有一笼无鸡可放,问有多少只鸡,多少个笼? 23.方程组 的解是否满足2x-y=8?满足2x-y=8的一对x,y的值是否是方程组 的解? 24.(开放题)是否存在整数m,使关于x的方程2x+9=2-(m-2)x在整数范围内有解,你能找到几个m的值?你能求出相应的x的解吗? 答案:一、选择题1.D 解析:掌握判断二元一次方程的三个必需条件:①含有两个未知数;②含有未知数的项的次数是1;③等式两边都是整式.2.A 解析:二元一次方程组的三个必需条件:①含有两个未知数,②每个含未知数的项次数为1;③每个方程都是整式方程.3.B 解析:不加限制条件时,一个二元一次方程有无数个解.4.C 解析:用排除法,逐个代入验证.5.C 解析:利用非负数的性质.6.B7.C 解析:根据二元一次方程的定义来判定,含有两个未知数且未知数的次数不超过1次的整式方程叫二元一次方程,注意⑧整理后是二元一次方程.8.B二、填空题9. 10. -1011. ,2 解析:令3m-3=1,n-1=1,∴m= ,n=2.12.-1 解析:把 代入方程x-ky=1中,得-2-3k=1,∴k=-1.13.4 解析:由已知得x-1=0,2y+1=0,∴x=1,y=- ,把 代入方程2x-ky=4中,2+ k=4,∴k=1.14.解: 解析:∵x+y=5,∴y=5-x,又∵x,y均为正整数,∴x为小于5的正整数.当x=1时,y=4;当x=2时,y=3;当x=3,y=2;当x=4时,y=1.∴x+y=5的正整数解为 15.x+y=12 解析:以x与y的数量关系组建方程,如2x+y=17,2x-y=3等,此题答案不唯一.16.1 4 解析:将 中进行求解.三、解答题17.解:∵y=-3时,3x+5y=-3,∴3x+5×(-3)=-3,∴x=4,∵方程3x+5y=-3和3x-2ax=a+2有相同的解,∴3×(-3)-2a×4=a+2,∴a=- .18.解:∵(a-2)x+(b+1)y=13是关于x,y的二元一次方程,∴a-2≠0,b+1≠0,∴a≠2,b≠-1 解析:此题中,若要满足含有两个未知数,需使未知数的系数不为0.(若系数为0,则该项就是0)19.解:由题意可知x=y,∴4x+3y=7可化为4x+3x=7,∴x=1,y=1.将x=1,y=1代入kx+(k-1)y=3中得k+k-1=3,∴k=2 解析:由两个未知数的特殊关系,可将一个未知数用含另一个未知数的代数式代替,化“二元”为“一元”,从而求得两未知数的值.20.解:由(│x│-1)2+(2y+1)2=0,可得│x│-1=0且2y+1=0,∴x=±1,y=- .当x=1,y=- 时,x-y=1+ = ;当x=-1,y=- 时,x-y=-1+ =- .解析:任何有理数的平方都是非负数,且题中两非负数之和为0,则这两非负数(│x│-1)2与(2y+1)2都等于0,从而得到│x│-1=0,2y+1=0.21.解:经验算 是方程 x+3y=5的解,再写一个方程,如x-y=3.22.(1)解:设0.8元的邮票买了x枚,2元的邮票买了y枚,根据题意得 . (2)解:设有x只鸡,y个笼,根据题意得 .23.解:满足,不一定.解析:∵ 的解既是方程x+y=25的解,也满足2x-y=8,∴方程组的解一定满足其中的任一个方程,但方程2x-y=8的解有无数组,如x=10,y=12,不满足方程组 .24.解:存在,四组.∵原方程可变形为-mx=7,∴当m=1时,x=-7;m=-1时,x=7;m=7时,x=-1;m=-7时x=1.

回答2:

1) 3X-(1/2+1/4)=7/12 3X=7/12+3/4 3X=4/3 X=4/9 (2) 6.6-5X=3/4-4X 6.6-0.75=-4X+5X X=5.85 (3) 1.1X+2.2=5.5-3.3X 1.1X+3.3X=5.5-2.2 4.4X=3.3 X=3/4=4/3 还有(0.5+x)+x=9.8÷2 2(X+X+0.5)=9.8 25000+x=6x 3200=450+5X+X X-0.8X=6 12x-8x=4.8 7.5*2X=15 1.2x=81.6 x+5.6=9.4 52-x =15 91÷x =1.3 X+8.3=10.7 15x =3 3x-8=16 7(x-2)=2x+3 3x+9=2718(x-2)=270 12x=300-4x 7x+5.3=7.4 3x÷5=4.8 30÷x+25=85 1.4×8-2x=6 6x-12.8×3=0.06 410-3x=170 3(x+0.5)=21 0.5x+8=43 6x-3x=18 1.5x+18=3x 5×3-x÷2=8 0.273÷x=0.35 1.8x=0.972 x÷0.756=90 9x-40=5 x÷5+9=21 48-27+5x=31 10.5+x+21=56 x+2x+18=78 (200-x)÷5=30 (x-140)÷70=4 0.1(x+6)=3.3×0.4 4(x-5.6)=1.6 7(6.5+x)=87.5 (27.5-3.5)÷x=4 x+19.8=25.8 5.6x=33.6 9.8-x=3.8 75.6÷x=12.6 5x+12.5=32.3 5(x+8)=102 x+3x+10=70 3(x+3)=50-x+3 5x+15=60 3.5-5x=2 0.3×7+4x=12.5 x÷1.5-1.25=0.75 4x-1.3×6=2.6 20-9x=1.2×6.25 6x+12.8=15.8 150×2+3x=690 2x-20=4 3x+6=18 2(2.8+x)=10.4 (x-3)÷2=7.5 13.2x+9x=33.3 3x=x+100 x+4.8=7.2 6x+18=48 3(x+2.1)=10.5 12x-9x=8.7 13(x+5)=169 2x-97=34.2 3.4x-48=26.8 42x+25x=134 1.5(x+1.6)=3.6 2(x-3)=5.8 65x+7=42 9x+4×2.5=91 4.2 x+2.5x=134 10.5x+6.5x=51 89x-43x=9.2 5x-45=100 1.2x-0.5x=6.3 23.4=2x=56 4x-x=48.6 4.5x-x=28 X-5.7=2.15 15 5X-2X=18 3X+0.7=5 3.5×2= 4.2+x 26×1.5= 2x+10 0.5×16―16×0.2=4x 13 9.25-X=0.403 16.9÷X=0. 3 X÷0.5=2.6 x+13=33 3 - 5x=80 1.8 +6x=54 6.7x -60.3=6.7 9 +4x =40 2x+8=16 x/5=10 x+7x=8 9x-3x=6 6x-8=4 5x+x=9 x-8=6x 4/5x=20 2x-6=12 7x+7=14 6x-6=0 5x+6=11 2x-8=10 1/2x-8=4 x-5/6=7 3x+7=28 3x-7=26 9x-x=16 24x+x=50 6/7x-8=4 3x-8=30 6x+6=12 3x-3=1 5x-3x=4 2x+16=19 5x+8=19 14-6x=8 15+6x=27 5-8x=4 7x+8=15 9-2x=1 4+5x=9 10-x=8 8x+9=17 9+6x=14 x+9x=4+7 2x+9=17 8-4x=6 6x-7=12 7x-9=8 x-56=1 8-7x=1 x-30=12 6x-21=21 6x-3=6 9x=18 4x-18=13 5x+9=11 6-2x=11 x+4+8=23 7x-12=8 X-5.7=2.15 15 5X-2X=18 3X 0.7=5 3.5×2= 4.2 x 26×1.5= 2x 0.5×16―16×0.2=4x 9.25-X=0.403 16.9÷X=0.3 X÷0.5=2.6 3-5x=80 1.8-6x=54 6.7x-60.3=6.7 9 +4x=40 0.2x-0.4+0.5=3.7 9.4x-0.4x=16.2 12-4x=20 1/3x+5/6x=1.4 12x+34x=1 18x-14x=12 23 x-5×14=14 12+34x=56 22-14x=12 23x-14x=14 x+14x=65 23x=14x+14希望采纳

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