\(=x^2-xm-xn+mn=x\left(x-m\right)-n\left(x-m\right)=\left(x-n\right)\left(x-m\right)\)
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\(=x^2-xm-xn+mn=x\left(x-m\right)-n\left(x-m\right)=\left(x-n\right)\left(x-m\right)\)
`m) xz-yz-x^2+2xy-y^2 `
ptđttnt
PTĐTTNT :
`-(x+2)+3(x^2-4)`
PTĐTTNT
`x^12+x^2+1`
x ³ + y ³ -2(x ² - y ²)
ptđttnt
PTĐTTNT : x^3 - x^2 - 7x + 15
PTĐTTNT:
`3x^2y-12x^3y^2`
`2x^2(x-y)-4xy(x-y)`
PTĐTTNT :
9-16(x-1)^2
Ptđttnt: 252x-16x2