Toán Lớp 8: PTĐTTNT: x^3 - x^2 - 4x^2 + 8x - 4

#laviken# x^3-x^2-4x^2+8x-4 =x^3-4x^2+4x-x^2+4x-4 =x(x^2-4+4)-(x^2-4x+4) =(x^2-4x+4)(x-1) =(x-2)^2(x-1)

#huy x^3-x^2-4x^2+8x-4 =x^2(x-1)-4(x^2-2x+1) =x^2(x-1)-4(x-1)^2 =(x-1)[x^2-4(x-1)] =(x-1)(x^2-4x+4) =(x-1)(x-2)^2

Toán Lớp 8: PTĐTTNT: `x^3 - x^2 - 4x^2 + 8x

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