因式分解:(1)x(x-y)+y(x-y)-(x-y)2(2)-14xy-x2-49y2(3)9(a+b)2-6(a+b
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因式分解:
(1)x(x-y)+y(x-y)-(x-y)2
(2)-14xy-x2-49y2
(3)9(a+b)2-6(a+b)+1
(4)25(a-2b)2-64(b+2a)2
(5)x2(a+b)-(a+b)
(6)(a2+9b2)2-36a2b2.
(1)x(x-y)+y(x-y)-(x-y)2
(2)-14xy-x2-49y2
(3)9(a+b)2-6(a+b)+1
(4)25(a-2b)2-64(b+2a)2
(5)x2(a+b)-(a+b)
(6)(a2+9b2)2-36a2b2.
(1)x(x-y)+y(x-y)-(x-y)2
=(x-y)[x+y-(x-y)]
=2y(x-y);
(2)-14xy-x2-49y2
=-(x2+49y2+14xy)
=-(x+7y)2;
(3)9(a+b)2-6(a+b)+1
=[3(a+b)-1]2
=(3a+3b-1)2;
(4)25(a-2b)2-64(b+2a)2
=[5(a-2b)+8(b+2a)][5(a-2b)-8(b+2a)]
=(21a-2b)(-11a-18b);
(5)x2(a+b)-(a+b)
=(a+b)(x+1)(x-1);
(6)原式=(a2+9b2+6ab)(a2+9b2-6ab)
=(a+3b)2(a-3b)2.
=(x-y)[x+y-(x-y)]
=2y(x-y);
(2)-14xy-x2-49y2
=-(x2+49y2+14xy)
=-(x+7y)2;
(3)9(a+b)2-6(a+b)+1
=[3(a+b)-1]2
=(3a+3b-1)2;
(4)25(a-2b)2-64(b+2a)2
=[5(a-2b)+8(b+2a)][5(a-2b)-8(b+2a)]
=(21a-2b)(-11a-18b);
(5)x2(a+b)-(a+b)
=(a+b)(x+1)(x-1);
(6)原式=(a2+9b2+6ab)(a2+9b2-6ab)
=(a+3b)2(a-3b)2.
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