用简便方法计算
2023-01-06
【题目】用简便方法计算。
0.125×0.25×8×4 7.4×0.28+0.28×2.6 15.89-3.2-6.8
【答案】解答:0.125×0.25×8×4
=(0.125×8)×(0.25×4)
=1×1
=1
7.4×0.28+0.28×2.6
=(7.4+2.6)×0.28
=10×0.28
=2.8
15.89-3.2-6.8
=15.89-(3.2+6.8)
=15.89-10
=5.89
【解析】0.125×0.25×8×4
=(0.125×8)×(0.25×4)
=1×1
=1
7.4×0.28+0.28×2.6
=(7.4+2.6)×0.28
=10×0.28
=2.8
15.89-3.2-6.8
=15.89-(3.2+6.8)
=15.89-10
=5.89
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