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解比例.4/3:12/11=x:20/1

12分之11×=4分之3乘20分之1 ×=80分之3乘11分之20 ×=55分之3 采纳啊啊啊啊

x-(3/2+4/1)=12/11 x-12/11=12/11 x=6/11

x-(4/12+9/12)=11/12 x-13/12=11/12 x=13/12+11/12=24/12=2 x=2

"表示英寸,1英寸=2.54cm 所以你自己可以算下: 28.6(长)*17.1(高)*8.9(宽) 单位:cm

3/4:11/12=x:20 11/12x=20×3/4 11/12x=15 x=180/11

4/3+23/11-4/1+23/12简便算法 3/4-1/4+11/23+12/23 =(3/4-1/4)+(11/23+12/23) =1/2+1 =3/2

x-(8/12+3/12)=11/12 x-11/12=11/12 x=11/12+11/12 x=22/12 x=11/6

x+4/3=12/11 x=12/11-4/3 x=36/33-44/33 x=-8/33 x-3/1=5/2 x-1/3=2/5 x=5/2+3 x=2/5+1/3=6/15+5/15 x=11/2 x=11/15

3/4+(1/3-x)=11/12 x=1/3+3/4-11/12 =1/3-1/6 =1/6 得到的x的值是6分之1

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