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1) ![frac{14 a^{3} b^{5} }{21 a^{4}b } = frac{2 b^{4} }{3a} frac{14 a^{3} b^{5} }{21 a^{4}b } = frac{2 b^{4} }{3a}](https://tex.z-dn.net/?f=+frac%7B14+a%5E%7B3%7D++b%5E%7B5%7D+%7D%7B21+a%5E%7B4%7Db+%7D+%3D+frac%7B2+b%5E%7B4%7D+%7D%7B3a%7D+)
2)![frac{ x^{2} +x}{ x^{2} }= frac{x(x+1)}{ x^{2} } = frac{x+1}{x} frac{ x^{2} +x}{ x^{2} }= frac{x(x+1)}{ x^{2} } = frac{x+1}{x}](https://tex.z-dn.net/?f=+frac%7B+x%5E%7B2%7D+%2Bx%7D%7B+x%5E%7B2%7D+%7D%3D++frac%7Bx%28x%2B1%29%7D%7B+x%5E%7B2%7D+%7D++%3D+frac%7Bx%2B1%7D%7Bx%7D+)
3)![frac{a+2b}{ a^{2}-4 b^{2} } = frac{a+2b}{(a+2b)(a-2b)} = frac{1}{a-2b} frac{a+2b}{ a^{2}-4 b^{2} } = frac{a+2b}{(a+2b)(a-2b)} = frac{1}{a-2b}](https://tex.z-dn.net/?f=+frac%7Ba%2B2b%7D%7B+a%5E%7B2%7D-4+b%5E%7B2%7D++%7D+%3D+frac%7Ba%2B2b%7D%7B%28a%2B2b%29%28a-2b%29%7D+%3D+frac%7B1%7D%7Ba-2b%7D+)
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