数学题化简比《教一教怎么求的》

2025-02-22 23:27:35
推荐回答(5个)
回答1:

6与10除以2等于3和5,所以3:5
162与84除以2等于81和42,再同除以3等于27:14
2/5与1/4同乘以100等于40和25,再同除以5,等于8和5,8:5
0.3和0.4同乘以10等于3和4,3:4
3和0.5同乘以10,等于30和5,再除以5,得6:1
1/20和1/5同乘以100,等于5:20,同除以5,得1:4
2/3和4.2变成2/3和21/5,再变成10/15和63/15,同乘以15,得10:63
36和15同除以3,得12:5
2和1/4同乘以100,得200和25,同除以25得8:1
39和52,同除以13,得3:4
6.3和0.9同乘以10,得63和9,同除以9,得7:1
二、75:200=15:40=3:8
5/8:2=0.625:2=625:2000=125:400=25:80=5:16

回答2:

一、两边如果有小数的话可以先都乘以十,再化简。6.3:0.9=63:9,两边都除以一个9,得7:1
二、分数的话可以都先去掉分母。2/5:1/4,两边乘以一个公倍数20,得8:5。
三、分数比小数,先把小数化成分数,再简化。
四、分数可以直接除,2/5:1/4=2/5×4=8/5=8:5。
过程如下:0.75=3/4,3/4:2=3:4(两边同时乘以2)

回答3:

6:10=6/10=3/5=3:5
北师大教材:先把比转化成分数,再进行约分,因为分子和分母相当于比里面的前项和后项,所以最后可以把约分后的分数转化成比的形式
162/48=27/8=27:8
分数先约分,再把约分后的分数转化成比
2/5:1/4=2/5÷1/4=2/5×4=8/5=8:5
两个分数的比可以先写成两个分数相除,除以一个分数等于乘于它的倒数,所以再写成乘法的形式,最后把分数写成比
0.3:0.4=3÷4=3:4
两个小数的比,先写成除法形式,接着运用商不变性质,除数与被除数同时扩大相同的倍数
剩下几题,请你自己用我讲的这些方法做一做

回答4:

6/10,分子分母同乘以2得:3/5
162/84,分子分母同乘以2得,81/42
2/5:1/4,2/5乘以4/1得:8/5
0.3/0.4,分子分母同乘以10得3/4
3/0.5,分子分母同乘以10得30/5=6
1/20:1/5,1/20乘以5/1得1/4
2/3:4.2,2/3乘以1/4.2得:1/6.3,分子分母同乘以10得10/63
36/15,分子分母同除以3得12/5
2:1/4,2乘以4/1得8
39/52,分子分母同除以13得3/4
6.3/0.9,分子分母同乘以10得63/9=7

回答5:

方法:遇到求分式的比,先化成单一的分式
(a:b):(c:d)=(a/b):(c/d)=(a/b)*(d/c)=ad/bc
遇到小数,先化成整数,分子分母同时乘以一个数(最好是最小公倍数)
最后是约分
6:10=3/5=3:5
162/84=81/42=27/14=27:14
(2/5):(1/4)=(2*4)/(5*1)=8/5=8:5
0.3:0.4=(0.3*10):(0.4*10)=3/4=3:4
3:0.5=(2*3)/(0.5*2)=6/1=6:1=6,或3:0.5=3:(1/2)=3*2/1=6:1=6
(1/20):(1/5)=(1*5)/(20*1)=5/20=1/4=1:4
(2/3):4.2=(2/3)/(21/5)=(2*5)/(3*21)=10/63=10:63
36:15=36/15=12/5=12:5
2:(1/4)=2/(1/4)=(2*4)/1=8:1=8
39/52=3/4=3:4
6.3:0.9=63/9=7/1=7:1=7
(5/8):2=(5/8):(2/1)=(5/8)*(1/2)=5/16=5:16

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