问题
计算题
因式分解:(x+2y)(3x﹣7y)2﹣4(x+y)2(x+2y)
答案
解:原式=(x+2y)[(3x﹣7y)2﹣4(x+y)2]
=(x+2y)[(3x﹣7y)+2(x+y)][(3x﹣7y)﹣2(x+y)]
=(x+2y)(5x﹣5y)(x﹣9y)
=5(x+2y)(x﹣y)(x﹣9y)
因式分解:(x+2y)(3x﹣7y)2﹣4(x+y)2(x+2y)
解:原式=(x+2y)[(3x﹣7y)2﹣4(x+y)2]
=(x+2y)[(3x﹣7y)+2(x+y)][(3x﹣7y)﹣2(x+y)]
=(x+2y)(5x﹣5y)(x﹣9y)
=5(x+2y)(x﹣y)(x﹣9y)