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简介:
一、先确定运算顺序,再计算
3.5×0.7+5.5×0.7+0.7 9.4×[1.28-(1.54-0.31)]
=(3.5+5.5+1)×0.7 =9.4×(1.28-1.23)
=10×0.7 =9.4×0.05
=7 =0.47
[(6.1-4.6)÷0.8-1]×0.4
=(1.5÷0.8-1)×0.4
=(1.875-1)×0.4
=0.875×0.4
=0.35
3.72÷[(54.7-17.5)×(0.45÷0.9)]
= 3.72÷(37.2×0.5)
= 3.72÷37.2÷0.5
= 0.1÷0.5
= 0.2