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数学
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9.87*7.2-0.987 怎么简便运算
人气:128 ℃ 时间:2020-03-31 12:04:35
解答
9.87*7.2-0.987
0.987x7.2x10-0.987
=0.987x(72-1)
=0.987x(70+1)
=0.987x70+0.987
=69.09+0.987
=70.077
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