Question

6supra4+5supra8+2supra5

Answer 1

$\frac{6}{4} + \frac{5}{8} + \frac{2}{5}$

Aduci la acelasi numitor:
$\frac{6}{4} = \frac{3}{2} = \frac{3 \times 20}{2 \times 20} = \frac{60}{40}$

$\frac{5}{8} = \frac{5 \times 5}{8 \times 5} = \frac{25}{40}$

$\frac{2}{5} = \frac{2 \times 8}{5 \times 8} = \frac{16}{40}$

Acum se aduna numaratorii si se copiaza numitorii
$\frac{60 + 25 + 16}{40} = \frac{101}{40} = 2 \frac{21}{40}$

Answer 2

6/4 +5/8+ 2/5 =
aducemla acelasi numitor
numitorul comun este 40
amplificam prima frac cu 10,  a doua cu 5 si a treia cu 8
60/40 +25/40 +16/40=(60+25+16)/40=101/40