分解因式:(1)a2x2y-axy2; (2)-14abc-7ab+49ab2c; (3)25(x-y)2+10(y-x)+1 (...
分解因式:(1)a2x2y-axy2;(2)-14abc-7ab+49ab2c;(3)25(x-y)2+10(y-x)+1(4)x(x-y)-y(y-x)(5)9(a-b...
分解因式:(1)a2x2y-axy2; (2)-14abc-7ab+49ab2c; (3)25(x-y)2+10(y-x)+1 (4)x(x-y)-y(y-x) (5)9(a-b)2-16(a+b)2 (6)3x3-12x2y+6xy2.
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(1)a2x2y-axy2=axy(ax-y);
(2)-14abc-7ab+49ab2c=-7ab(2c+1-7bc);
(3)25(x-y)2+10(y-x)+1=(5x-5y+1)2;
(4)x(x-y)-y(y-x)=(x-y)(x+y);
(5)9(a-b)2-16(a+b)2
=[3(a-b)+4(a+b)][3(a-b)-4(a+b)]
=(7a+b)(-a-7b)
=-(7a+b)(a+7b);
(6)3x3-12x2y+6xy2=3x(x2-4xy+2y2).
(2)-14abc-7ab+49ab2c=-7ab(2c+1-7bc);
(3)25(x-y)2+10(y-x)+1=(5x-5y+1)2;
(4)x(x-y)-y(y-x)=(x-y)(x+y);
(5)9(a-b)2-16(a+b)2
=[3(a-b)+4(a+b)][3(a-b)-4(a+b)]
=(7a+b)(-a-7b)
=-(7a+b)(a+7b);
(6)3x3-12x2y+6xy2=3x(x2-4xy+2y2).
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