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

Toán Lớp 8: (2x+3)^2 – 4 (x – 2 )(x + 2) Giúp mik vs

Toán Lớp 8: (2x+3)^2 – 4 (x – 2 )(x + 2)
Giúp mik vs

Comments ( 2 )

  1. (2x+3)^2 – 4(x-2)(x+2)
    = 4x^2 + 12x + 9 – 4(x^2 – 4)
    = 4x^2 + 12x + 9 – 4x^2 + 16
    = (4x^2 – 4x^2) + 12x + (16+9)
    = 12x + 25
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     (2x+3)^2 -4(x-2)(x+2)
    =4x^2 +12x +9 -4(x^2 -4)
    =4x^2 +12x+9-4x^2 +16
    =12x+25

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