Question

计算下面各题．①15.52-1.6×5-5.7②[

计算下面各题．①15.52-1.6×5-5.7②[（6.1-4.6）-0.8]×0.4③0.8×（4-3.38）×5④15.4÷[8×（6.34-4.59）]．

Answer 1

①15.52-1.6×5-5.7
=15.52-8-5.7
=7.52-5.7
=1.82

②[（6.1-4.6）-0.8]×0.4
=[1.5-0.8]×0.4
=0.7×0.4
=0.28

③0.8×（4-3.38）×5
=0.8×0.62×5
=（0.8×5）×0.62
=4×0.62
=2.48

④15.4÷[8×（6.34-4.59）]
=15.4÷[8×1.75]
=15.4÷14
=1.1．