Question

Calcule:

a) 1/3 + 2/5

b) 7/2 + 2/3

c) 3/2 - 2/3

d) 4/5 - 1/2

e) 3/4 + 5/6 - 1/2


Ajudaaaaaaa TwT”

Answer 1

Ok , vamos lá !!

❒  Resoluções :

A )

$\sf { \dfrac{1}{3} + \dfrac{2}{5} }$

$\sf { = \dfrac{5 \times 1 + 3 \times 2}{15} }$

$\sf { = \dfrac{5 + 6}{15} }$

$\red{\sf { = \dfrac{11}{15} }}$

B )

$\sf {\dfrac{7}{2} + \dfrac{2}{3} }$

$\sf {= \dfrac{3 \times 7 + 2 \times 2}{6} }$

$\sf {= \dfrac{21 + 4}{6} }$

$\red{ \sf {= \dfrac{25}{6} }}$

C )

$\sf { \dfrac{3}{2} - \dfrac{2}{3} }$

$\sf { = \dfrac{3 \times 3 -2 \times 2 }{6} }$

$\sf { = \dfrac{9 -4 }{6} }$

$\red{ \sf { = \dfrac{5 }{6} }}$

D )

$\sf { \dfrac{4}{5} - \dfrac{1}{2} }$

$\sf { = \dfrac{2 \times 4 - 5 \times 1}{10} }$

$\sf { = \dfrac{8 - 5}{10} }$

$\red{\sf { = \dfrac{3}{10} }}$

E )

$\sf {\dfrac{3}{4} + \dfrac{5}{6} - \dfrac{1}{2} }$

$\sf { = \dfrac{3 \times 3 + 2 \times 5 - 6 \times 1}{12} }$

$\sf { = \dfrac{9 + 10- 6 }{12} }$

$\sf { = \dfrac{19- 6 }{12} }$

$\red{\sf { = \dfrac{13 }{12} }}$

Mmc

$\sf {4 , 6 , 2 |2}$

$\sf {2 , 3 , 1 |2}$

$\sf {1 , 3 , 1 |3}$

$\sf {1, 1 ,1}$

$\sf {=2 × 2 × 3}$

$\sf {=4× 3}$

$\sf {=12}$

Bons estudos .

Answer 2

Oie, Td Bom?!

a)

• MMC (3 . 5 = 15).

$\frac{1}{3} + \frac{2}{5} = \frac{5}{15} + \frac{6}{15} = \frac{5 + 6}{15} = \frac{11}{15}$

b)

• MMC (2 . 3 = 6).

$\frac{7}{2} + \frac{2}{3} = \frac{21}{6} + \frac{4}{6} = \frac{21 + 4}{6} = \frac{25}{6}$

c)

• MMC (2 . 3 = 6).

$\frac{3}{2} - \frac{2}{3} = \frac{9}{6} - \frac{4}{6} = \frac{9 - 4}{6} = \frac{5}{6}$

d)

• MMC (5 . 2 = 10).

$\frac{4}{5} - \frac{1}{2} = \frac{8}{10} - \frac{5}{10} = \frac{8 - 5}{10} = \frac{3}{10}$

e)

• MMC (12).

$\frac{3}{4} + \frac{5}{6} - \frac{1}{2} = \frac{9}{12} + \frac{10}{12} - \frac{6}{12} = \frac{9 + 10 - 6}{12} = \frac{19 - 6}{12} = \frac{13}{12}$

Att. Makaveli1996