一个长方形的周长是36厘米、把长和宽都增长2厘米后它的面积是多少?
人气:135 ℃ 时间:2020-03-23 03:02:59
解答
设长宽分别为X,Y,则X+Y=18.长宽多增加两厘米则X+2+Y+2=22
你如果知道基本不等式,那X*Y
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