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6)
![frac{x^2-9}{2x-6}: frac{x+3}{5x-15}= frac{x^2-3^2}{2(x-3)}: frac{x+3}{5(x-3)}= frac{(x+3)}{2}* frac{5(x-3)}{x+3}= frac{1}{2}* frac{5(x-3)}{1}= frac{5(x-3)}{2} = \ =2.5(x-3)=2.5x-7.5 frac{x^2-9}{2x-6}: frac{x+3}{5x-15}= frac{x^2-3^2}{2(x-3)}: frac{x+3}{5(x-3)}= frac{(x+3)}{2}* frac{5(x-3)}{x+3}= frac{1}{2}* frac{5(x-3)}{1}= frac{5(x-3)}{2} = \ =2.5(x-3)=2.5x-7.5](https://tex.z-dn.net/?f=+frac%7Bx%5E2-9%7D%7B2x-6%7D%3A+frac%7Bx%2B3%7D%7B5x-15%7D%3D++frac%7Bx%5E2-3%5E2%7D%7B2%28x-3%29%7D%3A+frac%7Bx%2B3%7D%7B5%28x-3%29%7D%3D++frac%7B%28x%2B3%29%7D%7B2%7D%2A+frac%7B5%28x-3%29%7D%7Bx%2B3%7D%3D+frac%7B1%7D%7B2%7D%2A+frac%7B5%28x-3%29%7D%7B1%7D%3D+frac%7B5%28x-3%29%7D%7B2%7D+%3D+%5C+%3D2.5%28x-3%29%3D2.5x-7.5)
7)
![frac{x^2-25}{x-5}=0 \ ODZ \ x neq 5
frac{x^2-25}{x-5}=0 \ ODZ \ x neq 5](https://tex.z-dn.net/?f=+frac%7Bx%5E2-25%7D%7Bx-5%7D%3D0+%5C+ODZ+%5C+x+neq+5%0A%0A+)
x²-25=0
x²=25
x=√25
x1=5 -не подходит по ОДЗ
х2=-5
8)
![frac{3x+2}{4}+ frac{5x-1}{3}=2 \ frac{12(3x+2)}{4}+ frac{12(5x-1)}{3}=12*2 \ 3(3x+2)+ 4(5x-1)=24 \ 9x+6+20x-4=24 \ 29x+2=24 \ 29x=22 \ x=22/29
frac{3x+2}{4}+ frac{5x-1}{3}=2 \ frac{12(3x+2)}{4}+ frac{12(5x-1)}{3}=12*2 \ 3(3x+2)+ 4(5x-1)=24 \ 9x+6+20x-4=24 \ 29x+2=24 \ 29x=22 \ x=22/29](https://tex.z-dn.net/?f=+frac%7B3x%2B2%7D%7B4%7D%2B+frac%7B5x-1%7D%7B3%7D%3D2+%5C++frac%7B12%283x%2B2%29%7D%7B4%7D%2B+frac%7B12%285x-1%29%7D%7B3%7D%3D12%2A2+%5C+3%283x%2B2%29%2B+4%285x-1%29%3D24+%5C+9x%2B6%2B20x-4%3D24+%5C+29x%2B2%3D24+%5C+29x%3D22+%5C+x%3D22%2F29%0A++)
9)ни одно
правильно
![frac{15}{10+x}+ frac{5}{10-x} =2 frac{15}{10+x}+ frac{5}{10-x} =2](https://tex.z-dn.net/?f=+frac%7B15%7D%7B10%2Bx%7D%2B+frac%7B5%7D%7B10-x%7D++%3D2)
7)
x²-25=0
x²=25
x=√25
x1=5 -не подходит по ОДЗ
х2=-5
8)
9)ни одно
правильно
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