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8/5×5.3+5.7×8/5-0.625
人气:247 ℃ 时间:2020-03-16 12:37:14
解答
5/8×5.3+5.7×5/8-0.625
=5/8×5.3+5.7×5/8-5/8
=5/8x(5.3+5.7-1)
=5/8x10
=25/4
=6.25
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