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

Toán Lớp 8: (3x+1)^2-9(x-2)(x+2) Helppp meee

Toán Lớp 8: (3x+1)^2-9(x-2)(x+2)
Helppp meee

Comments ( 2 )

  1. Giải đáp:
     6x+37
    Lời giải và giải thích chi tiết:
     (3x+1)^2 – 9 (x-2)(x+2)
    = [(3x)^2 + 2 . 3x . 1 + 1^2] – 9 (x^2 – 2^2)
    = (9x^2 + 6x+1) – 9(x^2-4)
    = 9x^2 + 6x + 1 – 9x^2 + 36
    = (9x^2 – 9x^2) + 6x + (1+36)
    = 6x+37

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

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