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

Toán Lớp 8: Tính: a,3x^4(-2x^3+5x^2-2/3x+1/3) b,4x(x+1)^2-4x^2(x-1) c,(-x^3+6x^2-4x-5):(x-5)

Toán Lớp 8: Tính:
a,3x^4(-2x^3+5x^2-2/3x+1/3)
b,4x(x+1)^2-4x^2(x-1)
c,(-x^3+6x^2-4x-5):(x-5)

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $a) 3x^4\left(-2x^3+5x^2-\dfrac{2}{3}x+\dfrac{1}{3}\right) \\= \left(−2x^5+3x^2−4x^3\right):2x^2\\=−x^3+32−2x\\ b) 4x(x+1)^2-4x^2(x-1)\\=\left(x^3−2x^2y+3xy^2\right):(−12x)\\=−x^2+xy−3y^2\\ c)\left(-x^3+6x^2-4x-5\right):(x-5)\\=\left(3x^2y^2+6x^3y^3−12xy^2\right):3xy\\=xy+2x^2y^2−4y$

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