(1)18*20=360 (18*2)*(20#2)=360 (18#9)*
(1)18*20=360 (18*2)*(20#2)=360 (18#9)*
1/(1/18+1/24+1/30)=1/(20/360+15/360+6/360) =1/(41/360) =8.32
(1) 2/12*14+2/14*16+2/16*18+2/18*20+20=
12/9+()/18=20/()
填空:360÷(____×2)=360÷18____ (什么符号)_____(数字)
(X-X*20%-18-(X-X*20%-18)*10%=X*1/2-3(过程)
计算:(1/20+7/60+9/40)÷1/120=?7/8÷【3/10×(2/9+5/18))】=?
3/4=3/4=()/()=()/20;12/18=12/18=()/()=2/();2/9=()/45;像这样的题目如
计算题(简便运算) (20-2/55×1)+(19-2/55×2)+(18-2/55×3)+…+(1-2/55×20)=
():20=4分之3=12÷()=9:()=():18
360/X-360/(1+50%)X=2
(-10)+(-15)-(+18)-20=( )10( )15( )18(