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Упростим выражение:
![frac{y^2-6y+9}{y^2-9} : frac{10y - 30}{y^2 + 3y} = frac{y^2-2*y*3+3^2}{y^2-3^2} : frac{10(y-3)}{y(y+3)} = frac{(y-3)^2}{(y-3)(y+3)} * frac{y(y+3)}{10(y-3)} = \ \
= frac{y-3}{y+3} * frac{y(y+3)}{10(y-3)} = frac{y(y-3)(y+3)}{10(y-3)(y+3)} = frac{y}{10} = frac{1}{10} *y = 0.1y \ \](https://tex.z-dn.net/?f=+frac%7By%5E2-6y%2B9%7D%7By%5E2-9%7D+%3A++frac%7B10y+-+30%7D%7By%5E2+%2B+3y%7D+%3D++frac%7By%5E2-2%2Ay%2A3%2B3%5E2%7D%7By%5E2-3%5E2%7D+%3A++frac%7B10%28y-3%29%7D%7By%28y%2B3%29%7D+%3D+frac%7B%28y-3%29%5E2%7D%7B%28y-3%29%28y%2B3%29%7D+%2A+frac%7By%28y%2B3%29%7D%7B10%28y-3%29%7D+%3D+%5C++%5C+%0A%3D++frac%7By-3%7D%7By%2B3%7D+%2A+frac%7By%28y%2B3%29%7D%7B10%28y-3%29%7D+%3D++frac%7By%28y-3%29%28y%2B3%29%7D%7B10%28y-3%29%28y%2B3%29%7D+%3D++frac%7By%7D%7B10%7D+%3D++frac%7B1%7D%7B10%7D+%2Ay+%3D+0.1y++%5C++%5C+ "frac{y^2-6y+9}{y^2-9} : frac{10y - 30}{y^2 + 3y} = frac{y^2-2*y*3+3^2}{y^2-3^2} : frac{10(y-3)}{y(y+3)} = frac{(y-3)^2}{(y-3)(y+3)} * frac{y(y+3)}{10(y-3)} = \ \
= frac{y-3}{y+3} * frac{y(y+3)}{10(y-3)} = frac{y(y-3)(y+3)}{10(y-3)(y+3)} = frac{y}{10} = frac{1}{10} *y = 0.1y \ \")
при у =70 ⇒ 0,1 × 70 = 7
при у =70 ⇒ 0,1 × 70 = 7
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