Question

Como fazer essas contas ?

Answer 1

Boa tarde, para resolver essas questões basta multiplicar cruzado, ficando:

a) 2x/27=2/9

18x=54

x=54/18

x=3

b)3/8=48/x

3x=384

x=384/3

x=128

c)(3x-1)/6=3/4

12x-4=18

12x=18+4

12x=22

x=22/12

x=11/6

d)2/(x-3)=7/10

7x-21=20

7x=20+21

7x=41

x=41/7

e)(2x+1)/3x=3/5

10x+5=9x

10x-9x=-5

x=-5

f)(4y-5)/10=1/4

16y-20=10

16y=10+20

16y=30

y=30/16

y=15/8

g)(7+z)/7=4/9

63+9x=28

9x=28-63

9x=-35

x=-35/9

h)(3x-1)/2=11/5

15x-5=22

15x=22+5

15x=27

x=27/15

x=9/5

i)7/2=8/(x-4)

7x-28=16

7x=16+28

7x=44

x=44/7

Espero ter ajudado =)