Question

ex 9 va rog frumos ​

Answer 1

Răspuns:

Aducem la acelasi numitor.

a) $\frac{2}{5} + \frac{3}{10} = \frac{2 \times 2}{10 } + \frac{3}{10} = \frac{4 + 3}{10} = \frac{7}{10}$

b) $\frac{2}{9} + \frac{2}{3} = \frac{2}{9} + \frac{2 \times 3}{9} = \frac{2 + 6}{9} = \frac{8}{9}$

c) $\frac{3}{4} + \frac{5}{8} = \frac{3 \times 2}{8} + \frac{5}{8} = \frac{6 + 5}{8} = \frac{11}{8}$

d) $\frac{7}{8} + \frac{1}{2} = \frac{7}{8} + \frac{4 \times 1}{8} = \frac{7 + 4}{8} = \frac{11}{8}$

e) $\frac{1}{2} + \frac{1}{4} = 1 \times 2 + \frac{4}{4} = \frac{2 + 1}{4} = \frac{3}{4}$

f) $\frac{3}{10} + \frac{2}{5} = \frac{3}{10} + \frac{2 \times 2}{10} = \frac{3 + 4}{10} = \frac{7}{10}$

g) $\frac{1}{6} + \frac{2}{3} = \frac{1}{6} + 2 \times 2 = \frac{1 + 4}{6} = \frac{5}{6}$

h) $\frac{3}{5} + \frac{1}{20} = \frac{3 \times 4}{20} + \frac{1}{20} = \frac{12 + 1}{20} = \frac{13}{20}$

Sper ca te-am ajutat. - M1hai15