a) [tex]\frac{8}{14}+\frac{2}{7} = \frac{8}{14}:\quad \frac{4}{7} = \frac{8}{14}:\quad \frac{4}{7} = \frac{4+2}{7} = \frac{6}{7}[/tex]
b)[tex]\frac{2}{3}+\frac{5}{4} = \frac{8}{12}+\frac{15}{12} = \frac{8+15}{12} = \frac{23}{12}[/tex]
c)[tex]\frac{17}{6}-\frac{5}{3} =\frac{17}{6}-\frac{10}{6} =\frac{17-10}{6} =\frac{7}{6}[/tex]
d) [tex]\frac{7}{15}+\frac{9}{20} =\frac{28}{60}+\frac{27}{60} =\frac{28}{60}+\frac{27}{60} =\frac{55}{60} =\frac{11}{12}[/tex]
e)[tex]\frac{5}{2}+3 =\frac{3\cdot \:2}{2}+\frac{5}{2} =\frac{3\cdot \:2+5}{2} =\frac{3\cdot \:2+5}{2} =\frac{11}{2}[/tex]
f) [tex]4+\frac{8}{3} =\frac{4\cdot \:3}{3}+\frac{8}{3} =\frac{4\cdot \:3+8}{3} =\frac{20}{3}[/tex]
g) [tex]1-\frac{7}{5} =\frac{1\cdot \:5}{5}-\frac{7}{5} =\frac{1\cdot \:5-7}{5} =\frac{-2}{5} =-\frac{2}{5}[/tex]
i ) [tex]\frac{1}{3}+\frac{1}{6}+\frac{1}{12} =\frac{4}{12}+\frac{2}{12}+\frac{1}{12} =\frac{4+2+1}{12} =\frac{7}{12}[/tex]
j) [tex]\frac{7}{10}-\frac{2}{15}-\frac{7}{30} =\frac{21}{30}-\frac{4}{30}-\frac{7}{30} =\frac{21-4-7}{30} =\frac{10}{30} =\frac{1}{3}[/tex]
k) [tex]\frac{17}{4}-3 =-\frac{3\cdot \:4}{4}+\frac{17}{4} =\frac{-3\cdot \:4+17}{4} =\frac{5}{4}[/tex]
Sper că te-am ajutat!
Succes la școală!
