Question

Alguém sabe resolver essas coisas
POR FAVOR

Answer 1

Resposta:

8.

a)------------------------------------

12----9

x------18

9x=12.18

9x=216

x=216÷9

x=24

12-----9

18-----y

12y=9.18

12y=162

y=162÷12

y=13.5

b)--------------------------------------

x------8

2-----4

4x=8.2

4x=16

x=16÷4

x=4

y-----3

4------2

2y=3.4

2y=12

y=12÷2

y=6

c)-----------------------------

10-----9

x------3

9x=10.3

9x=30

x=30÷9

x=3.33

6-----y

9----3

9y=6.3

9y=18

y=18÷9

y=2

d)-------------------------

6-----9

8----8+y

48+6y=72

6y=72+(-48)

6y=24

y=24÷6

y=4

6----9

x----x+4

9x=6x+24

9x+(-6x)=24

3x=24

x=24÷3

x=8

9.

x------8

70---14

14x=8.70

14x=560

x=560÷14

x=40