Question

1 1 3
- + 1-4+(—8)
2

Answer 1

Răspuns:

7.

a)3/8

b)-4/3

8.

a)25/6

b)19/36

Explicație pas cu pas:

$7. a)\frac{1}{2}+1\frac{1}{4}+(-\frac{3}{8})=\\\frac{1}{2}+\frac{1}{4}-\frac{3}{8}=\\\frac{2}{4}+\frac{1}{4}-\frac{3}{8} =\\\frac{2+1}{4}-\frac{3}{8}=\\\frac{3}{4}-\frac{3}{8}=\\\frac{6}{8}-\frac{3}{8}=\\\frac{6-3}{8}=\\\frac{3}{8}$

$d) (-2\frac{1}{4})+(-\frac{2}{3})+\frac{5}{12}=\\\frac{-2}{4}-\frac{2}{3}+\frac{5}{12}=\\-\frac{1}{2}-\frac{2}{3}+\frac{5}{12}=\\-\frac{3-4}{6}+\frac{5}{12}=\\-\frac{14}{12}+\frac{5}{12}=\\\frac{-14+5}{12}=\\\frac{-9}{12}=\\-\frac{3}{4}$

$8. a)3\frac{1}{2} +\frac{2}{3} =\\\frac{6+1}{2}+\frac{2}{3} =\\\frac{7}{2}+\frac{2}{3}=\\\frac{21}{6}+\frac{4}{6}=\\\frac{21+4}{6}=\\\frac{25}{6}$

$d) (-\frac{3}{4})+1\frac{5}{18}=\\-\frac{3}{4}+\frac{18+5}{18}=\\-\frac{3}{4}+\frac{23}{18} =\\-\frac{27}{36}+\frac{46}{36}=\\\frac{-27+46}{36}=\\\frac{19}{36}$