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Ответ дал:
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3) 3x=4-1
3x=3
X=1
4) 6x+1=10
6x=10-1
6x=9
X=3/2
5) 240=3(25x+5)
80=25x+5
-25x=5-80
-25x=-75
X=3
6) 5x-14=6
5x=6+14
5x=20
X=4
3x=3
X=1
4) 6x+1=10
6x=10-1
6x=9
X=3/2
5) 240=3(25x+5)
80=25x+5
-25x=5-80
-25x=-75
X=3
6) 5x-14=6
5x=6+14
5x=20
X=4
Ответ дал:
0
▪3)
![frac{2.7}{9} = frac{1 frac{1}{5} }{3x + 1} \ 2.7(3x + 1) = 9 times 1 frac{1}{5} \ 2.7(3x + 1) = frac{9 times 6}{5} \ 2.7(3x + 1) = frac{54}{5} : : : : : | div 2.7 \ 3x + 1 = frac{54 times 10}{5 times 27} \ 3x + 1 = 2 times 2 \ 3x = 4 - 1 \ 3x = 3 : : : : : | div 3 \ x = 1 frac{2.7}{9} = frac{1 frac{1}{5} }{3x + 1} \ 2.7(3x + 1) = 9 times 1 frac{1}{5} \ 2.7(3x + 1) = frac{9 times 6}{5} \ 2.7(3x + 1) = frac{54}{5} : : : : : | div 2.7 \ 3x + 1 = frac{54 times 10}{5 times 27} \ 3x + 1 = 2 times 2 \ 3x = 4 - 1 \ 3x = 3 : : : : : | div 3 \ x = 1](https://tex.z-dn.net/?f=+frac%7B2.7%7D%7B9%7D++%3D++frac%7B1+frac%7B1%7D%7B5%7D+%7D%7B3x+%2B+1%7D++%5C+2.7%283x+%2B+1%29+%3D+9+times+1+frac%7B1%7D%7B5%7D++%5C+2.7%283x+%2B+1%29+%3D+frac%7B9+times+6%7D%7B5%7D++%5C+2.7%283x+%2B+1%29+%3D+frac%7B54%7D%7B5%7D++%3A++%3A++%3A++%3A++%3A++%7C+div+2.7+%5C+3x+%2B+1+%3D++frac%7B54+times+10%7D%7B5+times+27%7D++%5C+3x+%2B+1+%3D+2+times+2+%5C+3x+%3D+4+-+1+%5C+3x+%3D+3+%3A++%3A++%3A++%3A++%3A++%7C+div+3+%5C+x+%3D+1)
▪4)
![frac{1 frac{4}{5} }{2.5} = frac{7.2}{6x + 1} \ 6x + 1 = frac{2.5 times 7.2}{1 frac{4}{5} } \ 6x + 1 = frac{18}{ frac{9}{5} } \ 6x + 1 = frac{18 times 5}{9} \ 6x = 2 times 5 - 1 \ 6x = 9 \ x = frac{9}{6} = frac{3}{2} = 1 frac{1}{2} = 1.5 frac{1 frac{4}{5} }{2.5} = frac{7.2}{6x + 1} \ 6x + 1 = frac{2.5 times 7.2}{1 frac{4}{5} } \ 6x + 1 = frac{18}{ frac{9}{5} } \ 6x + 1 = frac{18 times 5}{9} \ 6x = 2 times 5 - 1 \ 6x = 9 \ x = frac{9}{6} = frac{3}{2} = 1 frac{1}{2} = 1.5](https://tex.z-dn.net/?f=+frac%7B1+frac%7B4%7D%7B5%7D+%7D%7B2.5%7D++%3D++frac%7B7.2%7D%7B6x+%2B+1%7D++%5C+6x+%2B+1+%3D++frac%7B2.5+times+7.2%7D%7B1+frac%7B4%7D%7B5%7D+%7D++%5C+6x+%2B+1+%3D+++frac%7B18%7D%7B+frac%7B9%7D%7B5%7D+%7D+++%5C+6x+%2B+1+%3D+++frac%7B18+times+5%7D%7B9%7D++%5C+6x++%3D++2+times+5+-+1+%5C+6x+%3D+9+%5C++x+%3D++frac%7B9%7D%7B6%7D++%3D++frac%7B3%7D%7B2%7D++%3D+1+frac%7B1%7D%7B2%7D++%3D+1.5)
▪5)
![frac{6}{1 frac{4}{5} } = frac{3x + 0.6}{2.88} \ 3x + 0.6 = frac{6 times 2.88}{1 frac{4}{5} } \ 3x + 0.6 = frac{17.28}{ frac{9}{5} } \ 3x + 0.6 = frac{17.28 times 5}{9} \ 3x = 9.6 - 0.6 \ x = 9 div 3 \ x= 3 frac{6}{1 frac{4}{5} } = frac{3x + 0.6}{2.88} \ 3x + 0.6 = frac{6 times 2.88}{1 frac{4}{5} } \ 3x + 0.6 = frac{17.28}{ frac{9}{5} } \ 3x + 0.6 = frac{17.28 times 5}{9} \ 3x = 9.6 - 0.6 \ x = 9 div 3 \ x= 3](https://tex.z-dn.net/?f=+frac%7B6%7D%7B1+frac%7B4%7D%7B5%7D+%7D++%3D++frac%7B3x+%2B+0.6%7D%7B2.88%7D++%5C+3x+%2B+0.6+%3D++frac%7B6+times+2.88%7D%7B1+frac%7B4%7D%7B5%7D+%7D++%5C+3x+%2B+0.6+%3D+frac%7B17.28%7D%7B+frac%7B9%7D%7B5%7D+%7D++%5C+3x+%2B+0.6+%3D+frac%7B17.28+times+5%7D%7B9%7D++%5C+3x+%3D+9.6+-+0.6+%5C+x+%3D+9+div+3++%5C+x%3D+3)
▪6)
![frac{ frac{3}{8} }{0.75} = frac{0.6}{x - 2.8} \ frac{3}{8} (x - 2.8) = 0.75 times 0.6 \ frac{3}{8} (x - 2.8) =0.45 : : : : : | div frac{3}{8} \ x - 2.8 = frac{45 times 8}{100 times 3} \ x - 2.8 = frac{15 times 2}{25} \ x = frac{6}{5} + 2.8 = 1 frac{1}{5} + 2.8 = 1.2 + 2.8 = 4 frac{ frac{3}{8} }{0.75} = frac{0.6}{x - 2.8} \ frac{3}{8} (x - 2.8) = 0.75 times 0.6 \ frac{3}{8} (x - 2.8) =0.45 : : : : : | div frac{3}{8} \ x - 2.8 = frac{45 times 8}{100 times 3} \ x - 2.8 = frac{15 times 2}{25} \ x = frac{6}{5} + 2.8 = 1 frac{1}{5} + 2.8 = 1.2 + 2.8 = 4](https://tex.z-dn.net/?f=+frac%7B+frac%7B3%7D%7B8%7D+%7D%7B0.75%7D++%3D++frac%7B0.6%7D%7Bx+-+2.8%7D++%5C++frac%7B3%7D%7B8%7D+%28x+-+2.8%29+%3D+0.75+times+0.6+%5C+frac%7B3%7D%7B8%7D+%28x+-+2.8%29+%3D0.45+%3A++%3A++%3A++%3A++%3A++%7C+div++frac%7B3%7D%7B8%7D++%5C+x+-+2.8+%3D++frac%7B45+times+8%7D%7B100+times+3%7D++%5C+x+-+2.8+%3D++frac%7B15+times+2%7D%7B25%7D++%5C+x+%3D++frac%7B6%7D%7B5%7D+++%2B++2.8+%3D+1+frac%7B1%7D%7B5%7D++%2B+2.8+%3D+1.2+%2B+2.8+%3D+4)
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