Question

Preciso das respostas urgente pf...

Answer 1

1- a) 2/4 3/x

multiplica cruzado

2x= 12

x=12/2

x=6

1- b) 4/12 x/21

multiplica cruzado

84=12x

-12x=-84 .(-1)

12x= 84

x= 84/12

x=7