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

Toán Lớp 8: Khai triển (tiếp) e) ( 5x – 1 ) ^3 f) ( x + 3 ) . ( x^2 – 3x + 9) g) -x^3 + 3x^2 – 3x + 1 h)( 2x^2 + 3y)^2

Toán Lớp 8: Khai triển (tiếp)
e) ( 5x – 1 ) ^3
f) ( x + 3 ) . ( x^2 – 3x + 9)
g) -x^3 + 3x^2 – 3x + 1
h)( 2x^2 + 3y)^2

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    $#hyn$
    $e)(5x-1)^3=(5x)^3-3(5x)^2.1+3.5x.1-1=125x^3-75x^2+15x-1$
    $f)(x+3).(x^2-3x+9)=(x+3).(x^2-3x+3^2)=x^3+27$
    $g)-x^3+3x^2-3x+1=(-x+1).(x-1).(x-1)=-(x-1)^3$
    $h)(2x^2+3y)^2=4x^4+2.2x^2.3y+9y^2=4x^4+12x^2y+9y^2$
     

  2. e/ (5x-1)^3
    = 125x^3-75x^2+15x-1
    f/ (x+3)(x^2-3x+9)
    = x^3+27
    g/ -x^3+3x^2-3x+1
    = -(x-1)^3
    h/ (2x^2+3y)^2
    = 4x^4+12x^2y+9y^2

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