Question

Porque Ninguém Me Ajuda?
​

Answer 1

1

a)

$\frac{5}{5}$

b)

$\frac{9}{7}$

c)

$\frac{2}{3}$

d)

$\frac{2}{15}$

e)

$\frac{16}{4}$

f)

$\frac{7}{12}$

3

a. 36.5

b. 66.4

c.127.25

d.136.15

e.3.5

f.926.33

Answer 2

Olá, siga a explicação:

1)

Como as bases são iguais basta adicionar ou subtrair os numeradores:

A)

$\dfrac{1}{5} - \dfrac{3}{5} + \dfrac{1}{5} = \dfrac{-1}{5}$

B)

$\dfrac{12}{7} - \dfrac{1}{7} - \dfrac{2}{7} = \dfrac{9}{7}$

C)

$\dfrac{1}{3} + \dfrac{1}{3} = \dfrac{2}{3}$

D)

$\dfrac{3}{15} - \dfrac{1}{15} = \dfrac{2}{15}$

E)

$\dfrac{2}{4} + \dfrac{3}{4} + \dfrac{11}{4} = \dfrac{16}{4}$

F)

$\dfrac{9}{12} - \dfrac{1}{12} - \dfrac{1}{12} = \dfrac{7}{12}$

2)

Pelo MMC:

A)

$\dfrac{1}{5}+ \dfrac{3}{4}+\dfrac{1}{2} = \dfrac{4+15+10}{20} = \dfrac{29}{20}$

B)

$\dfrac{12}{5} - \dfrac{1}{7} - \dfrac{2}{4} = \dfrac{336-20-70}{140} = \dfrac{246}{140}$

C)

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

D)

$\dfrac{3}{5} - \dfrac{1}{15} = \dfrac{9-1}{15} = \dfrac{8}{15}$

E)

$\dfrac{2}{5} + \dfrac{3}{4} + \dfrac{11}{7} = \dfrac{56+105+ 220}{140} = \dfrac{381}{140}$

F)

$\dfrac{9}{12} - \dfrac{1}{6} - \dfrac{1}{3} = \dfrac{9-2-4}{12} = \dfrac{3}{12}$

3)

A)

$49,7-13,2= 36,5$

B)

$75,2-8,8= 66,4$

C)

$128,3-1,05= 127,25$

D)

$138,2 - 2,05=136,15$

E)

$4,3-0,8= 3,5$

F)

$989,8-63,47= 926,33$

• Att. MatiasHP