Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 8: $x^{2}$ – 5x + 6 (x + 2) ($x^{2}$ – 2x + 4) – x ($x^{2}$ + 2)

Toán Lớp 8: $x^{2}$ – 5x + 6
(x + 2) ($x^{2}$ – 2x + 4) – x ($x^{2}$ + 2)

Comments ( 2 )

  1. Giải đáp:
    $x^2$-5x+6
    =$x^2$-2x-3x+6
    =($x^2$-2x)-(3x-6)
    =x(x-2)-3(x-2)
    =(x-2)(x-3)
    (x+2)($x^2$-2x+4)-x($x^2+2)
    =$x^3$-2$x^2$+4x+2$x^2$-4x+8-$x^3$+2x
    =($x^3$-$x^3$)+(-2$x^2$+2$x^2$)+(4x-4x+2x)+8
    =2x+8
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
     x^2 -5x+6
    =x^2 -3x-2x+6
    =x(x-3)-2(x-3)
    =(x-2)(x-3)
    (x+2)(x^2 -2x+4)-x(x^2 +2)
    =(x+2)(x^2 -2.x+2^2) -x(x^2 +2)
    =x^3 +2^3 -x^3 -2x
    =(x^3 -x^2) +8-2x
    =2(4-x)

Leave a reply

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

About Thanh Thu