15-4.25x2.5
=15-10.625
=4.375
所以这个数是4.375
一个数加上4.25乘2.5的积,和是15这个数是多少
一个数加上4.25乘2.5的积,和是15这个数是多少
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数学人气：677 ℃时间：2020-05-17 17:12:59
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