问题 解答题

因式分解:

(1)2a2b-6ab

(2)3x2y-3xy-6y

(3)3ax+4by+4ay+3bx

(4)(x2+y2)-16x2

(5)(x-y)(x-y-3)-10.

答案

(1)2a2b-6ab=2ab(a-3);

(2)3x2y-3xy-6y

=3y(x2-x-2)

=3y(x+1)(x-2);

(3)3ax+4by+4ay+3bx

=(3ax+3bx)+(4by+4ay)

=3x(a+b)+4y(a+b)

=(a+b)(3x+4y);

(4)(x2+y2)-16x2=(x2+4x+y2)(x2-4x+y2);

(5)(x-y)(x-y-3)-10

=(x-y)2-3(x-y)-10

=(x-y+2)(x-y-5).

问答题
单项选择题 B1型题