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2.7*9.9+1.27简便计算
人气:362 ℃ 时间:2020-01-28 04:37:28
解答
2.7*9.9+1.27
=2.7x9.9+1+0.27
=2.7x9.9+2.7x0.1+1
=2.7x(9.9+0.1)+1
=2.7x10+1
=28
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