问题
解答题
把下列各式分解因式.
(1)(xy)2-1
(2)3x2+6xy+3y2
(3)(x+y)2-4xy
(4)(a+b)2+2(a+b)+1.
答案
(1)原式=(xy+1)(xy-1);
(2)原式=3(x2+2xy+y2)=3(x+y)2;
(3)原式=x2+2xy+y2-4xy=x2-2xy+y2=(x-y)2;
(4)原式=(a+b+1)2.
把下列各式分解因式.
(1)(xy)2-1
(2)3x2+6xy+3y2
(3)(x+y)2-4xy
(4)(a+b)2+2(a+b)+1.
(1)原式=(xy+1)(xy-1);
(2)原式=3(x2+2xy+y2)=3(x+y)2;
(3)原式=x2+2xy+y2-4xy=x2-2xy+y2=(x-y)2;
(4)原式=(a+b+1)2.