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

Toán Lớp 8: (x-2)^2-(x-3)(x-1) ,,,,,,,,,,,,,,,,,,,,,,,

Toán Lớp 8: (x-2)^2-(x-3)(x-1) ,,,,,,,,,,,,,,,,,,,,,,,

Comments ( 2 )

  1. (x-2)^2-(x-3)(x-1)
    = x^2-4x+4-(x^2-x-3x+3)
    = x^2-4x+4-x^2+x+3x-3
    = (x^2-x^2)+(-4x+x+3x)+(4-3)
    = 0+0+1
    = 1

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $(x-2)^2-(x-3)(x-1)$
    $=(x^2-4x+4)-(x^2-3x-x+3)$
    $=x^2-4x+4-x^2+3x+x-3$
    $=1$

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

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