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

Toán Lớp 8: 5x(x-3)+(2x-1)(x+2) bằng bảo nhiêu

Toán Lớp 8: 5x(x-3)+(2x-1)(x+2) bằng bảo nhiêu

Comments ( 2 )

  1. 5x(x-3) + (2x-1)(x+2)
    = 5x.x – 5x.3 + 2x(x+2) – 1(x+2)
    = 5x^2 – 15x + 2x^2 + 4x – x – 2
    = (5x^2 + 2x^2) – (15x-4x+x) – 2
    = 7x^2 – 12x – 2

  2. 5x(x-3)+(2x-1)(x+2)
    ⇔ 5x² – 15x + 2x² + 4x – x – 2
    ⇔ 7x² – 12x – 2
     

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

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