分解因式:-3a^3m-12a^2m-15am 6a(a-b)-4b(b-a) 2(x-1)^2-x+1

问题描述:

分解因式:-3a^3m-12a^2m-15am 6a(a-b)-4b(b-a) 2(x-1)^2-x+1

3a^3m-12a^2m-15am=3am(a^2-4a-5)=3am(a-5)(a+1)6a(a-b)-4b(b-a) =6a(a-b)+4b(a-b)=2(a-b)(3a+2b)2(x-1)^2-x+1=2(x-1)^2-(x-1)=(x-1)[2(x-1)-1]=(x-1)(2x-2-1)=(x-1)(2x-3)