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

Toán Lớp 8: (2x+3)(x-4)-(2x^3-6x^2+10x):2x

Toán Lớp 8: (2x+3)(x-4)-(2x^3-6x^2+10x):2x

Comments ( 2 )

  1. (2x + 3)(x – 4) – (2x^3 – 6x^2 + 10x) : 2x
    = ( 2x^2 – 8x + 3x – 12 ) – 2x(x^2 – 3x + 5) : 2x
    = 2x^2 – 8x + 3x – 12 – x^2 + 3x – 5
    = x^2 – 2x – 17

  2. Hướng dẫn trả lời:
    (2x+3).(x-4) – (2x^3-6x^2+10x) ÷ 2x.
    = (2x^2 – 5x – 12) – 2x.(x^2 – 3x + 5) ÷ 2x.
    = (2x^2 – 5x – 12) – (x^2 – 3x + 5).
    = 2x^2 – 5x – 12 – x^2 + 3x – 5.
    = (2x^2 – x^2) + (- 5x + 3x) + (- 12 – 5).
    = x^2 + 2x – 17.
    Giải đáp:
    = x^2 + 2x – 17.

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

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