( ) 改正:
1.58×6.5= 6.93÷3.3= ☆256.4÷12≈
x+36=78 4 - x = 1.2 (100-3x)÷2 =38
x+0.25x=12.5
8.4-3x= 2.7
☆2x+0.6=1.08
16×2.3= 0.23×1.6= 0.23×0.016=