`(-5)/(-14)=20/(6-5x)`
`=> 5/14 =20/(6-5x)`
`=> 5(6-5x)=20 *14`
`=> 30-25x =280`
`=>25x=30-280`
`=>25x=-250`
`=>x=-250:25`
`=>x=-10`
`5/14 = 20/(6-5x)`
`5*(6-5x) = 14*20`
`30 - 25x = 280`
`-25x = 250`
`x = -10`
`(-5)/(-14)=20/(6-5x)`
`=> 5/14 =20/(6-5x)`
`=> 5(6-5x)=20 *14`
`=> 30-25x =280`
`=>25x=30-280`
`=>25x=-250`
`=>x=-250:25`
`=>x=-10`
`5/14 = 20/(6-5x)`
`5*(6-5x) = 14*20`
`30 - 25x = 280`
`-25x = 250`
`x = -10`
\(\dfrac{2}{3}+\dfrac{5}{6}+\dfrac{9}{10}+\dfrac{14}{15}+\dfrac{20}{21}+\dfrac{27}{28}+\dfrac{35}{36}+\dfrac{44}{45}\) kết quả bằng bao nhiêu a
a)\(\dfrac{2}{3}\)x-1=\(\dfrac{3}{2}\)
b)| 5x - \(\dfrac{1}{2}\)| - \(\dfrac{2}{7}\)= 25%
c)\(\dfrac{x-3}{4}\)=\(\dfrac{16}{x-3}\)
d)\(\dfrac{-8}{13}\)+\(\dfrac{7}{17}+\dfrac{21}{31}\)<x≤\(\dfrac{-9}{14}\)+4+\(\dfrac{5}{-14}\)(xϵZ)
Xin mời các đại tỉ cao nhân giúp em :((( em xin trân trọng cảm ơn :)))
Tính hợp lí:
\(a,\dfrac{6}{21}-\dfrac{-12}{44}+\dfrac{10}{14}-\dfrac{1}{-4}-\dfrac{18}{33}\\ b,\dfrac{3}{7}.\left(-\dfrac{2}{5}\right).2\dfrac{1}{3}.20.\dfrac{19}{72}\)
thực hiện phép tính
\(\dfrac{5}{12}+\dfrac{-7}{12}\)
\(\dfrac{1}{2}+\dfrac{-2}{3}\)
\(\dfrac{3}{5}-\dfrac{4}{3}\)
\(\dfrac{-15}{14}.\dfrac{21}{20}\)
Rút gọn các phân số sau:(cho mik xin cách giải ak)
a) \(\dfrac{\left(-14\right).15}{21.\left(-10\right)}\)
b)\(\dfrac{5.7-7.9}{7.2+6.7}\)
c)\(\dfrac{\left(-7\right).3+2.\left(-14\right)}{\left(-5\right).7-2.7}\)
d)\(\dfrac{3^9.3^{20}.2^8}{3^{24}.243.2^6}\)
e)\(\dfrac{2^{15}.5^3.2^6.3^4}{8.2^{18}.81.5}\)
f)\(\dfrac{24.315+3.561.8+4.124.6}{1+3+5+...+97+99-500}\)
Tìm x:
a) -2x + \(\dfrac{5}{7}\) = - \(\dfrac{5}{15}\) - \(\dfrac{3}{24}\)
b) 9 - 5x = - \(\dfrac{6}{18}\) + \(\dfrac{2}{7}\)
\(\left(\dfrac{11}{6}-\dfrac{5}{8}\right)\)x\(\dfrac{3}{5}+\dfrac{2}{5}:\dfrac{14}{15}\)
1) Thực hiện phép tính nhanh nhất nếu có thể:
a)
\(\dfrac{2}{7}+\dfrac{7}{7}.\dfrac{14}{25}\)
b)
\(\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}\)
c)
\(\left(\dfrac{-5}{28}+1,75+\dfrac{8}{35}\right):\left(-3\dfrac{9}{20}\right)\)
d)\(70,5-528:\dfrac{15}{2}\)
e)\(\dfrac{-7}{25}.\dfrac{39}{-14}.\dfrac{50}{78}\)
B=\(\dfrac{5}{6}\)+\(6\dfrac{5}{6}\)\(\left(11\dfrac{5}{20}-9\dfrac{1}{4}\right)\):\(8\dfrac{1}{3}\)
\(\dfrac{x}{3}-\dfrac{1}{4}=\dfrac{-5}{6}\)
\(\dfrac{2x}{3}=\dfrac{6}{x}\)
\(\dfrac{x-1}{14}=\dfrac{4}{x}\)
\(\dfrac{-x}{8}=\dfrac{-50}{x}\)
Tìm x