3/5*()=()*20=0.5*()=1
20千克比()千克轻10% ,()米比5米长2分之1 0.5除1.5=():3=60分之几=()%
5:( )=20 ( ):12=0.25 9:( )=1/3
(-0.5)+(3又1/4)+2.75+(-5又1/2) =
(9)÷15=3:(5)=(20)分之12=0.6=(60)%=5分之1×()=()成
3:5=()20分之()=15:()=()除以55=()%
(1)x:2=3:0.5 (2) 5:0.5=x:0.9 (3) 4:0.8=x:8 (4)0.5:8.4=5:x (5
解方程,看补充,1、 6(x+3)除以2=92、 20-0.5(x-2)=19.5
化简算式12(x-0.5)=-5(1-1/5x)=-5a+(3a-2)-3a-7=1/3(9y-3)+2(y+1)=
3/10*( )=5*( )=( )除以1/19=0.25*( )=1
()÷20=35/()=5/3=15:30=():60
15:()=()/20=5分之3=()%=()(填小数)
8/9-5/12= 7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/1