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(6.8-6.8*0.55)/8.5简便计算
人气:455 ℃ 时间:2020-01-24 13:36:09
解答
(6.8-6.8*0.55)/8.5
=6.8x(1-0.55)÷8.5
=6.8x0.45x2/17(约分得)
=0.4x0.9
=0.36
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