Question

25% - 3/2 + 0,5 . 12/5

0,25 . 7/3 . 30 . 0,5. 8/45

c) 9/23 . 5/8 + 9/23 . 3/8 - 9/23

Answer 1

\(\text{a)}25\%-\frac{3}{2}+0,5.\frac{12}{5}\)

\(=\frac{1}{4}-\frac{3}{2}+\frac{1}{2}.\frac{12}{5}\)

\(=-\frac{5}{8}+\frac{6}{5}\)

\(=-\frac{25}{40}+\frac{48}{40}\)

\(=\frac{23}{40}\)

\(b)0,25.\frac{7}{3}.30.\text{ }0,5.\frac{8}{45}\)

\(=\frac{1}{4}.\frac{7}{3}.30.\frac{1}{2}.\frac{8}{45}\)

\(=\frac{7}{12}.(30.\frac{8}{90})\)

\(=\frac{7}{12}.\frac{8}{3}\)

\(=\frac{14}{9}\)

\(c)\frac{9}{23}.\frac{5}{8}+\frac{9}{23}.\frac{3}{8}-\frac{9}{23}\)

\(=\frac{9}{23}.\left(\frac{5}{8}+\frac{3}{8}-1\right)\)

\(=\frac{9}{23}.0\)

\(=0\)