Tìm x: x-22,6 = 15,28 x=15,28 + 22,6 b) x-3/8 = 2+1/4

* Hướng dẫn giải

Lời giải

$$\begin{gathered} \mathit{a}\mathbf{)}\mathbf{ }x – 22, 6 = 15,28 \\ x = 15,28 + 22, 6 \\ x = 37,88. \end{gathered}$$

$$\begin{gathered} \mathit{b}\mathbf{)} \frac{17}{2}:x=5 \\ x=\frac{17}{2}:5 \\ x=\frac{17}{2}.\frac{1}{5} \\ x=\frac{17}{10} \end{gathered}$$

$$\begin{gathered} \mathit{c}\mathbf{)} x-\frac{3}{8}=2+\frac{1}{4} \\ x-\frac{3}{8}=\frac{8}{4}+\frac{1}{4} \\ x-\frac{3}{8}=\frac{9}{4} \\ x=\frac{9}{4}+\frac{3}{8} \\ x=\frac{18}{8}+\frac{3}{8} \\ x=\frac{21}{8} \end{gathered}$$