问题 计算题

分解因式:(1)(x-2y)2+8xy;

(2)6xy2-9x2y-y3

答案

解:(1)(x-2y)2+8xy

=x2-4xy+4y2+8xy

=x2+4xy+4y2

=(x+2y)2

(2)6xy2-9x2y-y3

=-y(9x2-6xy+y2

=﹣y(3x-y)2

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