Question

3道因式分解

18a^2-32b^2-18a+24b
x-y-y^2+x^2
4ma-2m-4a^2+4a-1

Answer 1

(1)2(9a^2-16b^2)-6(3a-4b)=2(3a-4b)(3a+4b)-6(3a-4b)=(3a-4b)(6a+8b-6)
(2)x-y-y^2+x^2=(x^2-y^2)+(x-y)
=(x+y)(x-y)+(x-y)=(x-y)(x+y+1);
(3)2m(2a-1)-(4a^2-4a+1)=2m(2a-1)-(2a-1)^2=(2a-1)(2m-2a+1);