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数学
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15.75×7分之伍+5.25×7分之伍—5.25等于几?
快滴.急用
人气:299 ℃ 时间:2020-04-23 03:12:54
解答
15.75*5/7+5.25*5/7-5.25
=5/7*(15.75+5.25)-5.25
=5/7*21-5.25
=15-5.25
=15-5-0.25
=10-0.25
=9.75
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