[tex]ex.1 \\ (2 + 3) \times 10 -1 0 \div 5 \\ 5 \times 10 - 2 \\ 50 - 2 \\ 48[/tex]
[tex]ex.2 \\ \frac{x + 2}{12} = \frac{7}{6} \\ 6 \times (x + 2) = 84 \\ x + 2 = 14 \\ x = 14 - 2 \\ x = 12 [/tex]
[tex]ex.3 \\ 6[/tex]
[tex]ex.4 \\ d = l \sqrt{2} = 5 \sqrt{2} cm[/tex]
[tex]ex.5 \\ 45°[/tex]
