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

Toán Lớp 8: PTĐTTNT : x ³ +x + 2 x ³ + 2x – 3

Toán Lớp 8: PTĐTTNT : x ³ +x + 2
x ³ + 2x – 3

Comments ( 2 )

  1. a)
    x^3+x+2
    =x^3+x^2-x^2-x+2x+2
    =(x^3+x^2)-(x^2+x)+(2x+2)
    =x^2(x+1)-x(x+1)+2(x+1)
    =(x+1)(x^2-x+2)
    b)
    x^3+2x-3
    =x^3-x^2-x^2+3x+x-3
    =(x^3-x^2)+(x^2-x)+(3x-3)
    =x^2(x-1)+x(x-1)+3(x-1)
    =(x-1)(x^2+x+3)

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

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

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