5×2=5+5=10
6×3=6+6+6=18
7×3=7+7+7=21
8×2=8+8=16
3/8----------9
1------------x
x=(1*9)/(3/8)=24
2)
a-9/16a=5 1/4
16/16a-9/16a=5 1/4
7/16a=5 1/4
a=(5 1/4)/(7/16)=12
3)
(3.1d-d)/0.2=1.05
2.1d=1.05*0.2
d=0.21/2.1=0.1
<span>(1 1/12+1 1/4)×1 19/56+2 5/8×1 3/7×1 1/9=175/24</span>