如图是4张一样大小的矩形纸片拼成的图形。请利用图形写出一个有

如图是4张一样大小的矩形纸片拼成的图形。请利用图形写出一个有关多项式分解因式的等式_____________________

答案

 (a+b)2-(a-b)2=4ab

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