Tìm x, biết: a) 17/6 - (x - 7/6) = 7/4 b) 4/3 + (1,25 - x) = 2,25

* Hướng dẫn giải

a)

$$\begin{gathered} \frac{17}{6}-\left(x-\frac{7}{6}\right)=\frac{7}{4} \\ \frac{17}{6}-x+\frac{7}{6}=\frac{7}{4} \\ x=\frac{9}{4} \end{gathered}$$

b) 

$$\begin{gathered} \frac{4}{3}+\left(1,25-x\right)=2,25 \\ \frac{4}{3}+1,25-x=2,25 \\ x=\frac{1}{3} \end{gathered}$$