问题
解答题
脱式计算,能简算的要简算.
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答案
(1)13.4+5.62+17.6+4.38,
=(13.4+17.6)+(5.62+4.38),
=31+10,
=41.
(2)3.4÷[(1.2+0.5)×5],
=3.4÷[1.7×5],
=3.4÷8.5,
=0.4.
(3)0.75×18÷0.15,
=13.5÷0.15,
=90.
(4)2.5×3.2×1.25,
=(2.5×0.4)×(8×1.25),
=1×10,
=10.