问题 解答题

分解因式:(1) 3x2-3y2

(2)(x+y)2-10(x+y)+25

答案

(1)3x2-3y2

=3(x2-y2),

=3(x+y)(x-y);

(2)(x+y)2-10(x+y)+25=(x+y-5)2

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