脱式计算
5.4÷2.7×0.8
=2×0.8
=1.6
5.4÷2.7×0.8=5.4x0.8/2.7【用2.7约分】=2x0.8=1.6
5.4÷2.7×0.8=2×0.8=1.6只能想起来这么个算法了
2×0.8=1.6
