Помогите пожалуйста решить 2 уравнения:
a) 2 1/14 - 1 1/9x = 1 5/21
b) 3 3/8 : (1/14 - 1 3/4) : 5 2/3
Ответы
Ответ дал:
0
▪а)
![2 frac{1}{14} - 1 frac{1}{9} x = 1 frac{5}{21} \ 2 frac{1}{14} - 1 frac{5}{21} = 1 frac{1}{9} x \ 1 frac{1}{9} x = 1 frac{3 - 5 times 2}{42} = 1 frac{3 - 10}{42} = 1 - frac{7}{42} = 1 - frac{1}{6} = frac{5}{6} \ 1 frac{1}{9} x = frac{5}{6} \ x = frac{5}{6} div frac{10}{9} = frac{5 times 9}{6 times 10} = frac{3}{2 times 2} = frac{3}{4} \ x = frac{3}{4} = 0.75 2 frac{1}{14} - 1 frac{1}{9} x = 1 frac{5}{21} \ 2 frac{1}{14} - 1 frac{5}{21} = 1 frac{1}{9} x \ 1 frac{1}{9} x = 1 frac{3 - 5 times 2}{42} = 1 frac{3 - 10}{42} = 1 - frac{7}{42} = 1 - frac{1}{6} = frac{5}{6} \ 1 frac{1}{9} x = frac{5}{6} \ x = frac{5}{6} div frac{10}{9} = frac{5 times 9}{6 times 10} = frac{3}{2 times 2} = frac{3}{4} \ x = frac{3}{4} = 0.75](https://tex.z-dn.net/?f=2+frac%7B1%7D%7B14%7D++-+1+frac%7B1%7D%7B9%7D+x+%3D+1+frac%7B5%7D%7B21%7D++%5C+2+frac%7B1%7D%7B14%7D++-+1+frac%7B5%7D%7B21%7D++%3D+1+frac%7B1%7D%7B9%7D+x+%5C+1+frac%7B1%7D%7B9%7D+x+%3D+1+frac%7B3+-+5+times+2%7D%7B42%7D++%3D+1+frac%7B3+-+10%7D%7B42%7D++%3D+1+-++frac%7B7%7D%7B42%7D++%3D+1+-++frac%7B1%7D%7B6%7D++%3D++frac%7B5%7D%7B6%7D++%5C+1+frac%7B1%7D%7B9%7D+x+%3D++frac%7B5%7D%7B6%7D++%5C+x+%3D++frac%7B5%7D%7B6%7D++div++frac%7B10%7D%7B9%7D++%3D++frac%7B5+times+9%7D%7B6+times+10%7D++%3D++frac%7B3%7D%7B2+times+2%7D++%3D++frac%7B3%7D%7B4%7D++%5C+x+%3D++frac%7B3%7D%7B4%7D++%3D+0.75)
▪б)
![3 frac{3}{8} div ( frac{1}{14} - 1 frac{3}{4} ) div 5 frac{2}{3} = frac{27}{8} div ( - 1 frac{ 21 -2 }{28} ) div frac{17}{3} = frac{27}{8} div ( - 1 frac{19}{28} ) times frac{3}{17} = frac{27}{8} times ( - frac{28}{47} ) times frac{3}{17} = - frac{27 times 7 times 3}{2 times 47 times 17} = - frac{567}{1598} 3 frac{3}{8} div ( frac{1}{14} - 1 frac{3}{4} ) div 5 frac{2}{3} = frac{27}{8} div ( - 1 frac{ 21 -2 }{28} ) div frac{17}{3} = frac{27}{8} div ( - 1 frac{19}{28} ) times frac{3}{17} = frac{27}{8} times ( - frac{28}{47} ) times frac{3}{17} = - frac{27 times 7 times 3}{2 times 47 times 17} = - frac{567}{1598}](https://tex.z-dn.net/?f=3+frac%7B3%7D%7B8%7D++div+%28+frac%7B1%7D%7B14%7D++-+1+frac%7B3%7D%7B4%7D+%29+div+5+frac%7B2%7D%7B3%7D++%3D++frac%7B27%7D%7B8%7D++div+%28+-+1+frac%7B+21+-2+%7D%7B28%7D+%29+div++frac%7B17%7D%7B3%7D++%3D++frac%7B27%7D%7B8%7D++div+%28+-+1+frac%7B19%7D%7B28%7D+%29+times++frac%7B3%7D%7B17%7D++%3D+frac%7B27%7D%7B8%7D++times+%28+-++frac%7B28%7D%7B47%7D+%29+times++frac%7B3%7D%7B17%7D++%3D++-++frac%7B27+times+7+times+3%7D%7B2+times+47+times+17%7D++%3D++-++frac%7B567%7D%7B1598%7D+)
▪б)
Вас заинтересует
1 год назад
1 год назад
8 лет назад
8 лет назад
8 лет назад