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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Phân tích đa thức thành nhân tử a) 2х3 — Зх2 – х —2 b) 2×3 — 5х2 — х+6 c) Зx4 — 8×3+ 6х2 -1

Toán Lớp 8: Phân tích đa thức thành nhân tử
a) 2х3 — Зх2 – х —2
b) 2×3 — 5х2 — х+6
c) Зx4 — 8×3+ 6х2 -1

Comments ( 1 )

  1. $a.2x^{3}-3x^2-x-2$
    $=2x^{3}-4x^2+x^2-2x+x-2$
    $=2x^{2}(x-2)+x(x-2)+(x-2)$
    $=(x-2)(2x^{2}+x+1)$
    $b.2x^{3}-5x^2-x+6$
    $=2x^{3}+2x^2-7x^2-7x+6x+6$
    $=2x^{2}(x+1)-7x(x+1)+6(x+1)$
    $=(x+1)(2x^{2}-7x+6)$
    $=(x+1)(2x^{2}-4x-3x+6)$
    $=(x+1)[2x(x-2)-3(x-2)]^{}$
    $=(x+1)(x-2)(2x-3)^{}$
    $c.3x^{4}-8x^3+6x^2-1$
    $=3x^{4}-6x^3+3x^3-2x^3+4x^2-2x-x^2+2x-1$
    $=3x^{2}(x^2-2x+1)-2x(x^2-2x+1)-(x^2-2x+1)$
    $=(x^{2}-2x+1)(3x^2-2x-1)$
    $=(x^{2}-2x+1)(3x^2-3x+x-1)$
    $=(x^{2}-2x+1)[3x(x-1)+(x-1)]$
    $=(x-1)(x^{2}-2x+1)(3x+1)$
    Chúc bạn học tốt !!!!!

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222-9+11+12:2*14+14 = ? ( )