Question

Ex 2
Vă rog urgent!!!!!!!!!!!!!!!!!!!​

Answer 1

Numără care fracții au și pui in fata. Se exemplu la prima ai 3. scrii așa. 3x(1/3)

Answer 2

Răspuns:

$a) \: \frac{1}{3} + \frac{1}{3} + \frac{1}{3} = \frac{1}{3} \times 3 = \frac{1}{3} \times \frac{3}{1} = \frac{1 \times 3}{3 \times 1} = \frac{3}{3} = 1$

$b) \: \frac{7}{13} + \frac{7}{13} + \frac{7}{13} + \frac{7}{13} = \frac{7}{13} \times 4 = \frac{7}{13} \times \frac{4}{1} = \frac{7 \times 4}{13 \times 1} = \frac{28}{13} = 2 \frac{2}{13}$

$c) \: \frac{3}{16} + \frac{3}{16} + ... + \frac{3}{16} = \frac{3}{16} \times 5 = \frac{3 \times 5}{16 \times 1} = \frac{15}{16}$

$d) \: \frac{1}{5} + \frac{1}{5} + ... + \frac{1}{5} = \frac{1}{5} \times 10 = \frac{1 \times 10}{5 \times 1} = \frac{1 \times 2}{1 \times 1} = \frac{2}{1} = 2$

$e) \: \frac{1}{10} + \frac{1}{10} + ... + \frac{1}{10} = \frac{1}{10} \times 50 = \frac{50}{10} = \frac{5}{1} = 5$

$\frac{5}{23} + \frac{5}{23} + ... + \frac{5}{23} = \frac{5}{23} \times 100 = \frac{500}{23} = 21 \times \frac{17}{23}$