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

Toán Lớp 8: (x-1980)^2+2(x-1980)(x+1980) Lam nhanh hộ mk vs

Toán Lớp 8: (x-1980)^2+2(x-1980)(x+1980)
Lam nhanh hộ mk vs

Comments ( 2 )

  1. $(x – 1980)² + 2(x – 1980)(x + 1980) + (x + 1980)²$
    $= (x – 1980 + x + 1980)²$
    $= (2x)² = 4x²$

  2. Đề sai
    sửa :
    (x-1980)^2 + 2(x-1980)(x+1980) + (x + 1980)^2
    = [(x – 1980)+(x+1980)]^2
    = (x-1980+x+1980)^2
    = (2x)^2 = 4x^2
    Nếu như làm theo đề
    (x-1980)^2 + 2(x-1980)(x+1980)
     = (x-1980)[(x-1980) + 2(x+1980)]
    = (x-1980)(x-1980+2x+3960)
    = (x – 1980)(3x + 1980)

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