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1) ![frac{1}{x}+ frac{1}{1 frac{2}{7}*x }= frac{4}{9} frac{1}{x}+ frac{1}{1 frac{2}{7}*x }= frac{4}{9}](https://tex.z-dn.net/?f=+frac%7B1%7D%7Bx%7D%2B+frac%7B1%7D%7B1+frac%7B2%7D%7B7%7D%2Ax+%7D%3D++frac%7B4%7D%7B9%7D++)
![frac{1}{x}+ frac{1}{ frac{9}{7}x } = frac{4}{9} frac{1}{x}+ frac{1}{ frac{9}{7}x } = frac{4}{9}](https://tex.z-dn.net/?f=+frac%7B1%7D%7Bx%7D%2B+frac%7B1%7D%7B+frac%7B9%7D%7B7%7Dx+%7D+%3D++frac%7B4%7D%7B9%7D+)
![frac{1}{x}+ frac{1}{ frac{9x}{7} } = frac{4}{9} frac{1}{x}+ frac{1}{ frac{9x}{7} } = frac{4}{9}](https://tex.z-dn.net/?f=+frac%7B1%7D%7Bx%7D%2B+frac%7B1%7D%7B+frac%7B9x%7D%7B7%7D+%7D+%3D++frac%7B4%7D%7B9%7D+)
![frac{1}{x} + frac{7}{9x} = frac{4}{9} frac{1}{x} + frac{7}{9x} = frac{4}{9}](https://tex.z-dn.net/?f=+frac%7B1%7D%7Bx%7D+%2B++frac%7B7%7D%7B9x%7D+%3D+frac%7B4%7D%7B9%7D+)
144=36x
36x=144
x=4, x≠0
2)![frac{2}{ frac{8}{5}x} - frac{1}{x} = frac{1}{12} frac{2}{ frac{8}{5}x} - frac{1}{x} = frac{1}{12}](https://tex.z-dn.net/?f=+frac%7B2%7D%7B+frac%7B8%7D%7B5%7Dx%7D+-++frac%7B1%7D%7Bx%7D+%3D++frac%7B1%7D%7B12%7D++)
![frac{5}{4x} - frac{1}{x} = frac{1}{12} frac{5}{4x} - frac{1}{x} = frac{1}{12}](https://tex.z-dn.net/?f=+frac%7B5%7D%7B4x%7D+-++frac%7B1%7D%7Bx%7D+%3D++frac%7B1%7D%7B12%7D+)
![frac{1}{4x} = frac{1}{12} frac{1}{4x} = frac{1}{12}](https://tex.z-dn.net/?f=+frac%7B1%7D%7B4x%7D+%3D++frac%7B1%7D%7B12%7D+)
4x=12
x=3, x≠0
3)![frac{2}{ frac{4x}{3} } - frac{1}{x}= frac{1}{4} frac{2}{ frac{4x}{3} } - frac{1}{x}= frac{1}{4}](https://tex.z-dn.net/?f=+frac%7B2%7D%7B+frac%7B4x%7D%7B3%7D+%7D+-++frac%7B1%7D%7Bx%7D%3D+frac%7B1%7D%7B4%7D++)
![frac{3}{2x}- frac{1}{x} = frac{1}{4} frac{3}{2x}- frac{1}{x} = frac{1}{4}](https://tex.z-dn.net/?f=+frac%7B3%7D%7B2x%7D-+frac%7B1%7D%7Bx%7D++%3D+frac%7B1%7D%7B4%7D++)
![frac{1}{2x} = frac{1}{4} frac{1}{2x} = frac{1}{4}](https://tex.z-dn.net/?f=frac%7B1%7D%7B2x%7D+%3D+frac%7B1%7D%7B4%7D)
2x=4
x=2, x≠0
144=36x
36x=144
x=4, x≠0
2)
4x=12
x=3, x≠0
3)
2x=4
x=2, x≠0
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