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а) ![frac{a(x-2y)}{b(2y-x)} =- frac{a(x-2y)}{b(x-2y)}=- frac{a}{b} frac{a(x-2y)}{b(2y-x)} =- frac{a(x-2y)}{b(x-2y)}=- frac{a}{b}](https://tex.z-dn.net/?f=+frac%7Ba%28x-2y%29%7D%7Bb%282y-x%29%7D+%3D-+frac%7Ba%28x-2y%29%7D%7Bb%28x-2y%29%7D%3D-+frac%7Ba%7D%7Bb%7D++)
б)![frac{5x(x-y)}{ x^{3}(y-x) }=- frac{5x(x-y)}{ x^{3}(x-y) }=- frac{5x}{ x^{3} } frac{5x(x-y)}{ x^{3}(y-x) }=- frac{5x(x-y)}{ x^{3}(x-y) }=- frac{5x}{ x^{3} }](https://tex.z-dn.net/?f=+frac%7B5x%28x-y%29%7D%7B++x%5E%7B3%7D%28y-x%29+%7D%3D-+frac%7B5x%28x-y%29%7D%7B+x%5E%7B3%7D%28x-y%29+%7D%3D-+frac%7B5x%7D%7B+x%5E%7B3%7D+%7D+++)
в)![frac{3a-36}{12b-ab}= frac{3(a-12)}{b(12-a)}=- frac{3(a-12)}{b(a-12)}=- frac{3}{b} frac{3a-36}{12b-ab}= frac{3(a-12)}{b(12-a)}=- frac{3(a-12)}{b(a-12)}=- frac{3}{b}](https://tex.z-dn.net/?f=+frac%7B3a-36%7D%7B12b-ab%7D%3D+frac%7B3%28a-12%29%7D%7Bb%2812-a%29%7D%3D-+frac%7B3%28a-12%29%7D%7Bb%28a-12%29%7D%3D-+frac%7B3%7D%7Bb%7D+++)
г)![frac{7b-14b^{2} }{42b^{2} -21b}= frac{7b(1-2b)}{21b(2b-1)}=- frac{7b(1-2b)}{21b(1-2b)}=- frac{7b}{21b} frac{7b-14b^{2} }{42b^{2} -21b}= frac{7b(1-2b)}{21b(2b-1)}=- frac{7b(1-2b)}{21b(1-2b)}=- frac{7b}{21b}](https://tex.z-dn.net/?f=+frac%7B7b-14b%5E%7B2%7D+%7D%7B42b%5E%7B2%7D+-21b%7D%3D+frac%7B7b%281-2b%29%7D%7B21b%282b-1%29%7D%3D-+frac%7B7b%281-2b%29%7D%7B21b%281-2b%29%7D%3D-+frac%7B7b%7D%7B21b%7D+++)
д)![frac{25-a^{2} }{3a-15}= frac{(5-a)(5+a)}{3(a-5)}=- frac{(a-5)(5+a)}{3(a-5)}=- frac{5+a}{3} frac{25-a^{2} }{3a-15}= frac{(5-a)(5+a)}{3(a-5)}=- frac{(a-5)(5+a)}{3(a-5)}=- frac{5+a}{3}](https://tex.z-dn.net/?f=+frac%7B25-a%5E%7B2%7D+%7D%7B3a-15%7D%3D+frac%7B%285-a%29%285%2Ba%29%7D%7B3%28a-5%29%7D%3D-+frac%7B%28a-5%29%285%2Ba%29%7D%7B3%28a-5%29%7D%3D-+frac%7B5%2Ba%7D%7B3%7D++++)
е)![frac{3-3x}{ x^{2} -2x+1}= frac{3(1-x)}{ (x-1)^{2} } =- frac{3(x-1)}{ (x-1)^{2} }=- frac{3}{x-1} frac{3-3x}{ x^{2} -2x+1}= frac{3(1-x)}{ (x-1)^{2} } =- frac{3(x-1)}{ (x-1)^{2} }=- frac{3}{x-1}](https://tex.z-dn.net/?f=+frac%7B3-3x%7D%7B+x%5E%7B2%7D+-2x%2B1%7D%3D+frac%7B3%281-x%29%7D%7B+%28x-1%29%5E%7B2%7D+%7D+%3D-+frac%7B3%28x-1%29%7D%7B+%28x-1%29%5E%7B2%7D+%7D%3D-+frac%7B3%7D%7Bx-1%7D++)
ж)![frac{8b^{2}-8a^{2} }{a^{2}-2ab+ b^{2} } = frac{8(b-a)(b+a) }{ (a-b)^{2} }=- frac{8(a-b)(b+a)}{ (a-b)^{2} } =- frac{8(a+b)}{a-b} frac{8b^{2}-8a^{2} }{a^{2}-2ab+ b^{2} } = frac{8(b-a)(b+a) }{ (a-b)^{2} }=- frac{8(a-b)(b+a)}{ (a-b)^{2} } =- frac{8(a+b)}{a-b}](https://tex.z-dn.net/?f=+frac%7B8b%5E%7B2%7D-8a%5E%7B2%7D++%7D%7Ba%5E%7B2%7D-2ab%2B+b%5E%7B2%7D++%7D+%3D+frac%7B8%28b-a%29%28b%2Ba%29+%7D%7B+%28a-b%29%5E%7B2%7D+%7D%3D-+frac%7B8%28a-b%29%28b%2Ba%29%7D%7B+%28a-b%29%5E%7B2%7D+%7D++%3D-+frac%7B8%28a%2Bb%29%7D%7Ba-b%7D+)
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