Question

Rezolvati si explicati cum ati facut:
1/5 + 1/7 + 4/5 +26/14

/ = supra

Answer 1

se aduce la acelasi numitor comun
$\frac{1}{5}+ \frac{1}{7}+ \frac{4}{5}+ \frac{26}{14}=$
14=2×7, 5 , 7, 14 deci
numitor comun=5×7×2=70
se vor amplifica prima fractie cu 14, a doua cu 10, a treia cu 14 si ultima cu 5
$\frac{1}{5}+ \frac{1}{7}+ \frac{4}{5}+ \frac{26}{14}=\frac{1*14}{70}+ \frac{1*10}{70}+ \frac{4*14}{70}+ \frac{26*5}{70}= \\ \\ = \frac{14+10+56+130}{70} \\ \\ =\frac{210}{70} =3 \\ \\ \frac{1}{5}+ \frac{1}{7}+ \frac{4}{5}+ \frac{26}{14}=3$

Answer 2

1/5+1/7+4/5+26/14=14/70+10/70+56/70+130/70=210/70=30
prima data aducem la acelasi numitor,facem adunarea,iar la urma am simplificat rezultatul cu 70