题目内容
分解因式:
(1)a(x+y)-b(x+y)
(2)16a2-1
(3)m2+4mn+4n2
(4)(x-1)(x-3)+1
(5)2m(a-b)-6n(b-a)
(6)(a2+1)2-4a2.
(1)a(x+y)-b(x+y)
(2)16a2-1
(3)m2+4mn+4n2
(4)(x-1)(x-3)+1
(5)2m(a-b)-6n(b-a)
(6)(a2+1)2-4a2.
(1)原式=(x+y)(a-b);
(2)原式=(4a+1)(4a-1);
(3)原式=(m+2n)2;
(4)原式=x2-4x+3+1=x2-4x+4=(x-2)2;
(5)原式=2m(a-b)+6n(a-b)=2(a-b)(m+3n);
(6)原式=(a2+1+2a)(a2+1-2a)=(a-1)2(a+1)2.
(2)原式=(4a+1)(4a-1);
(3)原式=(m+2n)2;
(4)原式=x2-4x+3+1=x2-4x+4=(x-2)2;
(5)原式=2m(a-b)+6n(a-b)=2(a-b)(m+3n);
(6)原式=(a2+1+2a)(a2+1-2a)=(a-1)2(a+1)2.
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