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

Toán Lớp 8: Rút gọn biểu thức: a) 5 $x^{3}$+4 $x^{2}$-3x(2 $x^{2}$+7x-1) Mn giúp mik nha, mik cảm ơn!!!

Toán Lớp 8: Rút gọn biểu thức:
a) 5 $x^{3}$+4 $x^{2}$-3x(2 $x^{2}$+7x-1)
Mn giúp mik nha, mik cảm ơn!!!

Comments ( 2 )

  1. 5x^3+4x^2-3x(2x^2+7x-1)
    =5x^3+4x^2-(6x^3+21x^2-3x)
    =5x^3+4x^2-6x^3-21x^2+3x
    =-x^3-17x^2+3x
     

  2. Giải đáp:
    5x^3 + 4x^2 – 3x (2x^2 + 7x -1)
    = 5x^3 + 4x^2 – 6x^3 – 21x^2 + 3x
    = ( 5x^3 – 6x^3 ) + ( 4x^2 – 21x^2 ) + 3x
    = -x^3-17x^2 +3x

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

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