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

Toán Lớp 8: a, x^3+1-x^2-x b, (x+y)^3-x3-y3

Toán Lớp 8: a, x^3+1-x^2-x
b, (x+y)^3-x3-y3

Comments ( 2 )

  1. Giải đáp:
    a)(x+1)(x-1)²
     b)xy(3x+3y)
    Lời giải và giải thích chi tiết:
    a)x³+1-x²-x
    =(x+1)(x²-x+1)-x(x+1)
    =(x+1)(x²-x+1-x)
    =(x+1)(x-1)²
    b)(x+y)³-x³-y³
    =x³+3x²y+3xy²+y³-x³-y³
    =3x²y+3xy²
    =xy(3x+3y)
     

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

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

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