题干

如图1,在边长为 a 的正方形中挖掉一个边长为 b 的小正方形 (a>b) ,把余下的部分剪拼成一长方形(如图2),通过计算两个图形(阴影部分)的面积,验证了一个等式,则这个等式是(    )

  

A:(a+2b)(ab)=a2+ab2b2

B:(a+b)2=a2+2ab+b2

C:(ab)2=a22ab+b2

D:a2b2=(a+b)(ab)

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D

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