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0.4×2.5+0.07××50的简便算法
是0.4×2.5+0.07×50的简便算法
人气:285 ℃ 时间:2020-04-10 19:11:39
解答
0.4×2.5+0.07×50
=0.4×2.5+1.4×2.5
=2.5×(0.4+1.4)
=2.5×1.8
=2.5×2×0.9
=5×0.9
=4.5
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