小明画了一个宽为x的长方形,长是宽的2倍,求它的面积是多少平方厘米?
小明画了一个宽为x的长方形,长是宽的2倍,求它的面积是多少平方厘米?
数学人气：398 ℃时间：2020-02-05 06:29:52
优质解答
由题意得 ：长=2x ∴面积=2x乘以x=2x²
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