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

Toán Lớp 8: ( ($\frac{1}{y}$ + $\frac{2}{x-y}$ ) x ( x – $\frac{x^2+Y^2}{x+y}$ ) nhân đa thức

Toán Lớp 8: ( ($\frac{1}{y}$ + $\frac{2}{x-y}$ ) x ( x – $\frac{x^2+Y^2}{x+y}$ )
nhân đa thức

Comments ( 2 )

  1. (1/y + 2/x-y) . (x – (x^2+y^2)/(x+y))
    = ((x – y + 2y)/(y(x – y))) . ((x^2 + xy – x^2 – y^2)/(x+y))
    = ((x+y)/(xy – y^2)) . ((xy – y^2)/(x + y))
    = ((x+y) . (xy – y^2))/((xy – y^2) . (x + y))
    = 1              

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

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