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分解因式:(1)9x3y3-21x3y2+12x2y2;(2)x2(x-y)+y2(y-x);(3)(x-y)2+2(x-y)w+w2;(4)(p-4)(p+1)+3p.
题目详情
分解因式:
(1)9x3y3-21x3y2+12x2y2;
(2)x2(x-y)+y2(y-x);
(3)(x-y)2+2(x-y)w+w2;
(4)(p-4)(p+1)+3p.
(1)9x3y3-21x3y2+12x2y2;
(2)x2(x-y)+y2(y-x);
(3)(x-y)2+2(x-y)w+w2;
(4)(p-4)(p+1)+3p.
▼优质解答
答案和解析
(1)9x3y3-21x3y2+12x2y2=3x2y2(3xy-7x+4);
(2)x2(x-y)+y2(y-x)
=(x-y)(x2-y2)
=(x+y)(x-y)2;
(3)(x-y)2+2(x-y)w+w2=(x-y+w)2;
(4)(p-4)(p+1)+3p
=p2-3p-4+3p
=p2-4
=(p+2)(p-2).
(2)x2(x-y)+y2(y-x)
=(x-y)(x2-y2)
=(x+y)(x-y)2;
(3)(x-y)2+2(x-y)w+w2=(x-y+w)2;
(4)(p-4)(p+1)+3p
=p2-3p-4+3p
=p2-4
=(p+2)(p-2).
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