Đáp án:
a. ( x - $\dfrac{1}{2}$) x $\dfrac{5}{3}$ = $\dfrac{7}{4}$ - $\dfrac{1}{2}$
=> (x-$\dfrac{1}{2}$) x $\dfrac{5}{3}$ = $\dfrac{5}{4}$
=> x- $\dfrac{1}{2}$ = $\dfrac{5}{4}$ : $\dfrac{5}{3}$
=> x - $\dfrac{1}{2}$ = $\dfrac{3}{4}$
=> x = $\dfrac{3}{4}$ + $\dfrac{1}{2}$
=> x = $\dfrac{5}{4}$
Vậy x= $\dfrac{5}{4}$
b. (x-$\dfrac{4}{3}$) x $\dfrac{7}{4}$ = 5 - $\dfrac{7}{6}$
=> (x-$\dfrac{4}{3}$) x $\dfrac{7}{4}$ = $\dfrac{23}{6}$
=> x- $\dfrac{4}{3}$ = $\dfrac{23}{6}$ : $\dfrac{7}{4}$
=> x - $\dfrac{4}{3}$ = $\dfrac{46}{21}$
=> x = $\dfrac{46}{21}$ + $\dfrac{4}{3}$
=> x = $\dfrac{74}{21}$
Vậy x =$\dfrac{74}{21}$
