2.6-8,4 2.5 1 8 - 5 6 . 9 20 1,54 : 1,4-0,5 8,26-1,52:2 20:준호

1) \[\frac{2.6 - 8.4}{2.5} = \frac{-5.8}{2.5} = -2.32\]

2) \[\frac{1}{8} - \frac{5}{6} \cdot \frac{9}{20} = \frac{1}{8} - \frac{5 \cdot 9}{6 \cdot 20} = \frac{1}{8} - \frac{45}{120} = \frac{15}{120} - \frac{45}{120} = \frac{-30}{120} = -0.25\]

3) \[1.54 : 1.4 - 0.5 = 1.1 - 0.5 = 0.6\]

4) \[8.26 - 1.52 : 2 = 8.26 - 0.76 = 7.5\]

5) \[2 \frac{5}{8} : \frac{3}{4} + \frac{1}{2} = \frac{21}{8} : \frac{3}{4} + \frac{1}{2} = \frac{21}{8} \cdot \frac{4}{3} + \frac{1}{2} = \frac{21 \cdot 4}{8 \cdot 3} + \frac{1}{2} = \frac{84}{24} + \frac{1}{2} = 3.5 + 0.5 = 4\]