Question

Efetue as operações de frações de dominadores


a)1/3+1/5

b)3/4+1/2

c)2/4+2/3

d)2/5+3/10

e)5/3+1/6

f)1/4+2/3+1/2

g)1/2+1/7+5/7

h)3/7+5/2+1/14

i)4/5+1/3+7/6


j)1/3+5/6+3/4​

Answer 1

a)

$\frac{1}{3} + \frac{1}{5} =\\\\\frac{5}{15} + \frac{3}{15} =\\\\\frac{5+3}{15} = \frac{8}{15}$

b)

$\frac{3}{4}+ \frac{1}{2} =\\\\\frac{3}{4}+ \frac{2}{4} =\\\\\frac{3+2}{4} = \frac{5}{4}$

c)

$\frac{2}{4} + \frac{2}{3} =\\\\\frac{6}{12} + \frac{8}{12} = \frac{6+8}{12} = \frac{14}{12}$

Mas você pode simplificar o 14/12, ele vira:

$\frac{14}{12} = \frac{7}{6}$

tô com preguiça de escrever com o recurso de funções, vou escrever de modo simplificado. Acho que você entende:

$\frac{x}{y}$ = x/y

d)

2/5 + 3/10 =

4/10 + 3/10 =

4+3/10 = 7/10

e)

5/3 + 1/6 =

10/6 + 1/6 =

10 + 1 / 6 = 11/6

f)

1/4 + 2/3 + 1/2 =

3/12 + 8/12 + 6/12 =

3+ 8 + 6 / 12 = 17/12

g)

1/2 + 1/7 + 5/7 =

7/14 + 2/14 + 10/14 =

7+2+10 / 14 = 19/14

h)

3/7 + 5/2 + 1/14 =

6/14 + 35/14 + 1/14 =

6+35+1 / 14 =

42/14 = 3

i)

4/5 + 1/3 + 7/6 =

24/30 + 10/30 + 35/30 =

24 + 10 + 35 / 30 =

69/30

simplificando fica:

69/30 = 23/10