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

Toán Lớp 8: a) ($x^{3}$ – $x^{2}$ – 5x -3):(x-3) b) ( $x^{3}$+1):($x^{2}$-x+1)

Toán Lớp 8: a) ($x^{3}$ – $x^{2}$ – 5x -3):(x-3)
b) ( $x^{3}$+1):($x^{2}$-x+1)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     a) (x^3-x^2-5x-3):(x-3)
     =(x^3-3x^2+2x^2-6x+x-3):(x-3)
     =[x^2(x-3)+2x(x-3)+(x-3)]:(x-3)
     =(x-3)(x^2+2x+1):(x-3)
     =x^2+2x+1
     =(x+1)^2
     b) (x^3+1):(x^2-x+1)
     =(x+1)(x^2-x.1+1^2):(x^2-x+1)
     =(x+1)(x^2-x+1):(x^2-x+1)
     =x+1

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

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