Question

A) 5/21+3/14

B)7/6-4/16

C)5/4-3/10+7/6

Answer 1

Oi...

a)

5/21 + 3/14 ⇒mmc = 42

10/42 + 9/42

19/42

b)

7/6 - 4/16

7/6 - 1/4⇒mmc = 12

14/12 - 3/12

11/12

c)

5/4 - 3/10 + 7/6⇒mmc = 60

75/60 - 18/60 + 70/60

145/60 - 18/60

126/60

Bons estudos.