因式分解 m二次方(a+b)-(a+b) 4(x-y)二次方- 4z(x-y)+z二次方 xy二次方-2xy+2y-4(x+2)(x-3)+x二次方-4
问题描述:
因式分解 m二次方(a+b)-(a+b) 4(x-y)二次方- 4z(x-y)+z二次方 xy二次方-2xy+2y-4
(x+2)(x-3)+x二次方-4
答
解m^2(a+b)-(a+b)=(m+1)(m-1)(a+b)............4(x-y)^2-4z(x-y)+z^2=(2x-2y-z)^2.....xy^2-2xy+2y-4=(xy+2)(y-2)
答
m²(a+b)-(a+b)=(a+b)(m²-1)=(a+b)(m+1)(m-1)
4(x-y)²-4z(x-y)+z²=[2(x-y)]²-2×2(x-y)×z+z²=[2(x-y)-z]²=(2x-2y-z))²
xy²-2xy+2y-4=(xy²-2xy)+(2y-4)=xy(y-2)+2(y-2)=(y-2)(xy+2)
(x+2)(x-3)+x²-4=(x+2)(x-3)+(x-2)(x+2)=(x+2)(x-3+x-2)=(x+2)(2x-5)