因式分解1.x^2+xy-yz-xz4a^2+3c-3ac-4a -4a^2-12a(x-y)-9(x-y)^2ab-b^2-bc+ac 4/9m^2-4/3(a+b)m+(a+b)^2快一点!急用

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因式分解1.x^2+xy-yz-xz4a^2+3c-3ac-4a -4a^2-12a(x-y)-9(x-y)^2ab-b^2-bc+ac 4/9m^2-4/3(a+b)m+(a+b)^2快一点!急用
因式分解1.x^2+xy-yz-xz
4a^2+3c-3ac-4a -4a^2-12a(x-y)-9(x-y)^2
ab-b^2-bc+ac 4/9m^2-4/3(a+b)m+(a+b)^2快一点!急用

因式分解1.x^2+xy-yz-xz4a^2+3c-3ac-4a -4a^2-12a(x-y)-9(x-y)^2ab-b^2-bc+ac 4/9m^2-4/3(a+b)m+(a+b)^2快一点!急用
x^2+xy-yz-xz
=x(x+y)-z(x+y)
=(x-z)(x+y)
4a^2+3c-3ac-4a
=4a(a-1)-3c(a-1)
=(4a-3c)(a-1)
-4a^2-12a(x-y)-9(x-y)^2
=-[3(x-y)+2a]^2
ab-b^2-bc+ac
=b(a-b)+c(a-b)
=(b+c)(a-b)
4/9m^2-4/3(a+b)m+(a+b)^2
=[(a+b)-2/3m]^2