7.2x2.4十0.57÷1.9的简便运算?
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发布时间:2024-10-18 21:16
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热心网友
时间:2024-11-16 07:00
回答:
7.2×2.4+0.57÷1.9
=7.2×2.4+0.3
=4×1.8×(2.5-0.1)+0.3
=4×1.8×2.5-4×1.8×0.1+0.3
=18-0.72+0.3
=17.28+0.3
=17.58
运用了乘法分配律
热心网友
时间:2024-11-16 07:04
7.2x2.4十0.57÷1.9
=7.2x0.3x8+0.3
=0.3(57.6+1)
=0.3x58.6
=17.58
热心网友
时间:2024-11-16 06:56
7.2x2.4+0.57÷1.9
=7.2x3x0.8+0.3
=21.6x0.8+0.3
=17.28+0.3
=17.58