1)
[tex] \frac{4x + 5y}{y} [/tex]
если
[tex] \frac{x}{y} = - 2[/tex]
2)
[tex] \frac{ {x}^{2} - 2xy \times {y}^{2} }{xy} [/tex]
если
[tex] \frac{x}{y} = - 2[/tex]
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