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8.4*0.25简算 原式:8.4*0.25
人气:155 ℃ 时间:2020-03-20 07:33:01
解答
8.4×0.25
=(8+0.4)×0.25
=8×0.25+0.4×0.25
=4×0.25×2+0.4×0.25
=1×2+0.1
=2+0.1
=2.1
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