Question

1.Efectuați calculele:
a) 2/7+5/7(doi supra șapte+cinci supra sapte)
b) 3/11+6/11+2/11
c)1/2+1/3+1/6
d)8/13-9/13+1/13
e)5/6-1/4-5/12
f)1/12+5/6-3/4
Vă rog! ​

Answer 1

$a) \frac{2}{7} + \frac{5}{6} ( \frac{2}{7} + \frac{5}{7} )$

$\frac{2}{7} + \frac{5}{6} \times 1$

$\frac{2}{7} + \frac{5}{6}$

$\frac{47}{42}$

$b) \frac{3}{11} + \frac{6}{11} + \frac{2}{11}$

$\frac{3 + 6 + 2}{11}$

$\frac{11}{11}$

$1$

$c) \frac{1}{2} + \frac{1}{3} + \frac{1}{6}$

$\frac{3 + 2 + 1}{6}$

$\frac{6}{6}$

$1$

$d) \frac{8}{13} - \frac{9}{13} + \frac{1}{13}$

$\frac{8 - 9 + 1}{13}$

$\frac{0}{13}$

$0$

$e) \frac{5}{6} - \frac{1}{4} - \frac{5}{12}$

$\frac{10 - 3 - 5}{12}$

$\frac{2}{12}$

$\frac{1}{6}$

$f) \frac{1}{12} + \frac{5}{6} - \frac{3}{4}$

$\frac{1 + 10 - 9}{12}$

$\frac{2}{12}$

$\frac{1}{6}$