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

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

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

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     a, 3x(5x^2-2x-1)
    =15x^3 – 6x^2 -3x
    b, (2x+3)(3x-5)
    =6x^2 -10x+9x-15
    =6x^2-x-15 

  2. a) 3x(5x^2 – 2x – 1)
    = 15x^3 – 6x^2 – 3x
    b) (2x + 3)(3x – 5)
    = 6x^2 – 10x + 9x – 15
    = 6x^2 – x – 15

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

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