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

Toán Lớp 8: x/ x-2=x-2/x-3 x+1/x-2-12/x2-4=x+7/x+2

Toán Lớp 8: x/ x-2=x-2/x-3
x+1/x-2-12/x2-4=x+7/x+2

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     x/(x-2) = (x-2)/(x-3)
    -> x/(x-2) – (x-2)/(x-3) = 0
    -> [ x(x-3) – (x-2)² ]/(x-2)(x-3) = 0
    -> ( x² – 3x – x² + 4x – 4) / (x-2)(x-3) = 0
    -> (x-4)/(x-2)(x-3) = 0
    -> x – 4 = 0
    -> x = 4
    (x+1)/(x-2) – 12/(x²-4) = (x+7)/(x+2)
    -> (x+1)/(x-2) – 12/(x²-4) – (x+7)/(x+2) = 0
    -> [(x+1)(x+2) – 12 – (x+7)(x-2)]/(x²-4) = 0
    -> ( x² + 3x + 2 – 12 – x² – 5x + 14 ) / (x² – 4) = 0
    -> (-2x + 4)/(x²-4) = 0
    -> -2x + 4 = 0
    -> -2x = -4
    -> x = 2

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

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