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2.2×22%+7.8×2.2-4.4的简便计算
人气:457 ℃ 时间:2020-05-24 12:55:11
解答
2.2×22%+7.8×2.2-4.4
=2.2×(22%+7.8-2)
=2.2×6.02
=2.2×6+2.2×0.02
=13.2+0.044
=13.244
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