Tìm x:

\(\frac{x-3}{3}=\frac{27}{x-3}\)

Tìm x :\(\left(\frac{3x}{7}+1\right):\left(-4\right)=-\frac{1}{28}\)

Tìm x \(\frac{x}{5}=\frac{2}{3}\)

tính

\(A=\frac{1}{2.4}+\frac{1}{4.6}+\frac{1}{6.8}+.....+\frac{1}{2018.2020}\)

tìm x:

\(\left(x-\frac{2}{3}\right)^2=\frac{5}{6}\)

\(C=\left(\frac{2}{3}-\frac{1}{4}+\frac{5}{11}\right):\left(\frac{5}{12}+1-\frac{7}{11}\right)\)

\(D=1\frac{1}{3}+\frac{1}{8}:\left(0,75-\frac{1}{2}\right)-\frac{25}{100}.\frac{1}{2}\)

\(E=\left(-\frac{1}{2}\right)^2-\left(-2\right)^2-5^0\)

Tính

B=\(\left(\frac{4}{5}+\frac{1}{2}\right):\left(\frac{3}{12}-\frac{8}{13}\right)\)

N=\(\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}.\left(-2\right)^2\)

b)\(\left(x-\frac{1}{2}\right):\frac{1}{3}+\frac{5}{7}=9\frac{5}{7}\)