~ Bạn tham khảo ~
`bb{c, 6x^3-4x^2-6x+4}`
`bb{= 6x(x^2-1)-4(x^2-1)}`
`bb{= (x-1)(x+1)(6x-4)}`
`bb{= 2(x-1)(x+2)(3x-2)}`
`bb{d,3(x+3)-x^2+9}`
`bb{=3(x+3)-(x-3)(x+3)}`
`bb{=(x+3)(3-x+3)}`
`bb{=(x+3)(6-x)}`
`bb{e,x^2-y^2+xz-yz}`
`bb{=(x-y)(x+y)+z(x-y)}`
`bb{x=(x-y)(x+y+z)}`
`bb{f,x^2+6x-y^2+9}`
`bb{=(x+3)^2-y^2}`
`bb{=(x+3-y)(x+3+y)}`
