a)
\(\frac{1}{4}\)+x=\(\frac{5}{2}\)*\(\frac{8}{7}\)
\(\frac{1}{4}\)+x=\(\frac{20}{7}\)
x=\(\frac{20}{7}\)-\(\frac{1}{4}\)
x=\(\frac{73}{28}\)
b)
\(\frac{7}{3}\)-x=\(\frac{11}{5}\):\(\frac{5}{6}\)
\(\frac{7}{3}\)-x=\(\frac{66}{25}\)
x=\(\frac{66}{25}\)+\(\frac{7}{3}\)
x=\(\frac{373}{75}\)
c)
\(\frac{23}{6}\):x-\(\frac{2}{5}\)=\(\frac{1}{4}\)
\(\frac{23}{6}\):x =\(\frac{1}{4}\)+\(\frac{2}{5}\)
\(\frac{23}{6}\):x =\(\frac{13}{20}\)
x =\(\frac{23}{6}\):\(\frac{13}{20}\)
x =\(\frac{269}{60}\).
x + 13 = 34
x = 34 - 13
x = 21
Vậy x = 21