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б)
![( frac{c+3}{c-3}- frac{c}{c+3} )* frac{c-3}{c+1}= frac{(c+3)^2-c(c-3)}{(c-3)(c+3)}* frac{c-3}{c+1}= \ \
= frac{c^2+6c+9-c^2+3c}{c+3}* frac{1}{c+1}= frac{9c+9}{c+3}* frac{1}{c+1}= \ \
= frac{9(c+1)}{c+3}* frac{1}{c+1}= frac{9}{c+3}](https://tex.z-dn.net/?f=%28+frac%7Bc%2B3%7D%7Bc-3%7D-+frac%7Bc%7D%7Bc%2B3%7D++%29%2A+frac%7Bc-3%7D%7Bc%2B1%7D%3D+frac%7B%28c%2B3%29%5E2-c%28c-3%29%7D%7B%28c-3%29%28c%2B3%29%7D%2A+frac%7Bc-3%7D%7Bc%2B1%7D%3D+%5C++%5C+%0A%3D+frac%7Bc%5E2%2B6c%2B9-c%5E2%2B3c%7D%7Bc%2B3%7D%2A+frac%7B1%7D%7Bc%2B1%7D%3D+frac%7B9c%2B9%7D%7Bc%2B3%7D%2A+frac%7B1%7D%7Bc%2B1%7D%3D+%5C++%5C+%0A%3D+frac%7B9%28c%2B1%29%7D%7Bc%2B3%7D%2A+frac%7B1%7D%7Bc%2B1%7D%3D+frac%7B9%7D%7Bc%2B3%7D++++++++++ "( frac{c+3}{c-3}- frac{c}{c+3} )* frac{c-3}{c+1}= frac{(c+3)^2-c(c-3)}{(c-3)(c+3)}* frac{c-3}{c+1}= \ \
= frac{c^2+6c+9-c^2+3c}{c+3}* frac{1}{c+1}= frac{9c+9}{c+3}* frac{1}{c+1}= \ \
= frac{9(c+1)}{c+3}* frac{1}{c+1}= frac{9}{c+3}")
г)
![(frac{a}{a-4}- frac{a-4}{a+4} )* frac{a+4}{4}= frac{a(a+4)-(a-4)^2}{(a-4)(a+4)}* frac{a+4}{4}= \ \
= frac{a^2+4a-a^2+8a-16}{a-4}* frac{1}{4}= frac{12a-16}{a-4}* frac{1}{4}= \ \
= frac{4(3a-4)}{a-4} * frac{1}{4}= frac{3a-4}{a-4}](https://tex.z-dn.net/?f=+%28frac%7Ba%7D%7Ba-4%7D-+frac%7Ba-4%7D%7Ba%2B4%7D++%29%2A+frac%7Ba%2B4%7D%7B4%7D%3D+frac%7Ba%28a%2B4%29-%28a-4%29%5E2%7D%7B%28a-4%29%28a%2B4%29%7D%2A+frac%7Ba%2B4%7D%7B4%7D%3D+%5C++%5C+%0A%3D+frac%7Ba%5E2%2B4a-a%5E2%2B8a-16%7D%7Ba-4%7D%2A+frac%7B1%7D%7B4%7D%3D+frac%7B12a-16%7D%7Ba-4%7D%2A+frac%7B1%7D%7B4%7D%3D+%5C++%5C+%0A%3D+frac%7B4%283a-4%29%7D%7Ba-4%7D+%2A+frac%7B1%7D%7B4%7D%3D+frac%7B3a-4%7D%7Ba-4%7D+++++++++ "(frac{a}{a-4}- frac{a-4}{a+4} )* frac{a+4}{4}= frac{a(a+4)-(a-4)^2}{(a-4)(a+4)}* frac{a+4}{4}= \ \
= frac{a^2+4a-a^2+8a-16}{a-4}* frac{1}{4}= frac{12a-16}{a-4}* frac{1}{4}= \ \
= frac{4(3a-4)}{a-4} * frac{1}{4}= frac{3a-4}{a-4}")
г)
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