Question

tìm x:

a)\(\left(\frac{5}{8}.0,6-5:3\frac{1}{3}\right).\left(\frac{1}{5}-1.4\right).\left(-5\right)^2.x=120\)

b)\(\left|x-\frac{1}{4}\right|=\frac{3}{4}\)

c)\(\left(\frac{3}{7}x+\frac{2}{3}x\right).2\frac{1}{3}=\frac{-14}{3}\)

Answer 1

a, \(\left(\frac{5}{8}.0,6-5:3\frac{1}{3}\right).\left(\frac{1}{5}-1,4\right).\left(-5\right)^2.x=120\)

\(\left(\frac{5}{8}.\frac{3}{5}-5:\frac{10}{3}\right)\left(\frac{1}{5}-\frac{7}{5}\right).25x=120\)

\(\left(\frac{3}{8}-\frac{3}{2}\right)\left(-\frac{6}{5}\right).25x=120\)

\(\left(-\frac{9}{8}\right).\left(-\frac{6}{5}\right).25x=120\)

\(\frac{27}{20}.25x=120\)\(25x=120:\frac{27}{20}=\frac{800}{9}\)

\(x=\frac{800}{9}:25=\frac{32}{9}\)

đợi tí đi nấu cơm đã