Question

分解因式2a(x+y)—3b(y+x)=(x+y)()

(1)x^2-2x=_____.
(2)分解因式:2a(x+y)-3b(y+x)=(x+y)(______).
(3)分解因式:m(a-b)+n(b-a)=(a-b)(______).
(4)-5乘3^4 +7乘3^3 +(5乘3)^2=______.

Answer 1

(1）顷谨拦雀胡晌核x^2-2x=x(x-2)
(2)2a(x+y)-3b(x+y) =(x+y)(2a-3b)
(3)(m+n)
(4) -5*3^4+7*3^3+(5*3)^2=-5*3^4+7*3^3+5^2*3^2
=3^2(-5*3^2+7*3+25)=9(-45+21+25)=-9