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

Toán Lớp 8: $\frac{12(x+y)}{x+2}$ x $\frac{y-x}{8y²-2x²}$

Toán Lớp 8: $\frac{12(x+y)}{x+2}$ x $\frac{y-x}{8y²-2x²}$

Comments ( 1 )

  1. \frac{12(x+y)}{x+2} . \frac{y-x}{8y^2 – 2x^2}
    = \frac{12(y+x)}{x+2} . \frac{y-x}{2(4y^2 – x^2)}
    = \frac{12(y+x)(y-x)}{(x+2)(2y-x)(2y+x)}

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