4×(2.5+0.7)=4×2.5+×0.7
1.6×(5+3)=1.6×5+1.6×
(1.25×8)×6=1.25×(8×)
2.5×(4×9)=(2.5×)×9
2.4×7=×2.4
3.6+(4.4+8)=(3.6+)+8
(12.5+7.5)+6=12.5+(+6)
18.6+7.4=7.4+
4.8÷0.16=(4.8×25)÷(0.16×)
6.48÷0.18+3.42÷0.18=(6.48+)÷0.18