Question

Operatii cu numere rationale :
1/6+3/8 =
7/20 - 1/10 = 
5/4 ori 3/4
1/3+ 1/3 =
6/8 inpartit la 2 =
12/18 + 1 =
2/15 +1/35
2/3:1/35 =

Answer 1

 a) $\frac{1}{6} + \frac{3}{8} = \frac{4+3*3}{24} = \frac{12}{24} = \frac{1}{2}$
b)  $\frac{7}{20} - \frac{1}{10} = \frac{7-2*1}{20} = \frac{5}{20} = \frac{1}{4}$
c)$\frac{5}{4} * \frac{3}{4} = \frac{5*3}{4*4} = \frac{15}{16}$
d)$\frac{1}{3} + \frac{1}{3} = \frac{1+1}{3} = \frac{2}{3}$
e)$\frac{6}{8} : 2 = \frac{6}{8} : \frac{2}{1} = \frac{6}{8} * \frac{1}{2} = \frac{6*1}{8*2} = \frac{6}{16} = \frac{3}{8}$
f)$\frac{12}{8} + \frac{1}{1} = \frac{12+ 8*1}{8} = \frac{20}{8} = \frac{5}{2}$
g)$\frac{2}{15} + \frac{1}{35} = \frac{7*2 +3*1 }{105} = \frac{17}{105}$
h)$\frac{2}{3} : \frac{1}{35} = \frac{2}{3} * \frac{35}{1} = \frac{35*2}{3*1} = \frac{70}{3}$