问题
解答题
将下列各式分解因式:
(1)x2-9x;
(2)2x2-12x+18;
(3)8(x2-2y2)-x(7x+y)+xy.
答案
(1)x2-9x=x(x-9);
(2)2x2-12x+18,
=2(x2-6x+9),
=2(x-3)2;
(3)8(x2-2y2)-x(7x+y)+xy,
=8x2-16y2-7x2-xy+xy,
=x2-16y2,
=(x+4y)(x-4y).
将下列各式分解因式:
(1)x2-9x;
(2)2x2-12x+18;
(3)8(x2-2y2)-x(7x+y)+xy.
(1)x2-9x=x(x-9);
(2)2x2-12x+18,
=2(x2-6x+9),
=2(x-3)2;
(3)8(x2-2y2)-x(7x+y)+xy,
=8x2-16y2-7x2-xy+xy,
=x2-16y2,
=(x+4y)(x-4y).