Đáp án:
Giải thích các bước giải:
a. x= $\frac{2}{5}$ - $\frac{1}{3}$ = $\frac{1}{15}$
b. x= $\frac{1}{5}$ +$\frac{2}{3}$ = $\frac{13}{15}$
c. x= $\frac{16}{5}$ : $\frac{4}{25}$ = 20
d. $\frac{5}{7}$ : x = $\frac{1}{6}$ - $\frac{4}{5}$
=> $\frac{5}{7}$ : x = $\frac{-19}{30}$
=> x = $\frac{5}{7}$ : $\frac{-19}{30}$ =$\frac{-150}{133}$
e. $\frac{1}{4}$ : x = -2 - $\frac{3}{4}$
=> $\frac{1}{4}$ : x = $\frac{-11}{4}$
=> x = $\frac{1}{4}$ : $\frac{-11}{4}$ = $\frac{-1}{11}$
f. $\frac{-2}{3}$x = $\frac{3}{10}$ - $\frac{1}{5}$
=>$\frac{-2}{3}$x = $\frac{1}{10}$
=> x = $\frac{1}{10}$ : $\frac{-2}{3}$= $\frac{-3}{20}$
g. $\frac{2}{3}$x = $\frac{1}{10}$ + $\frac{1}{2}$
=> $\frac{2}{3}$x = $\frac{3}{5}$
=>x = $\frac{3}{5}$ : $\frac{2}{3}$ = $\frac{9}{10}$
h. $\frac{3}{2}$x - $\frac{11}{5}$ = $\frac{8}{7}$
=> $\frac{3}{2}$x = $\frac{117}{35}$
=> x = $\frac{78}{35}$
