Question

Calcule o valor de x nas proporções: a) x+2/5=2/13
b)x-3/5=3/7
c)2/4=6/x+6
d)7/6=2/y-7
e)-7/6=8/y+3
f)-5/x+4=5/4

Answer 1

A) x+2/5=2/13=
13x+26=10
13x=10-26
13x=-16
x=-16/13
x=-1,2

B) x-3/5=3/7
7x-21=15
7x=15+21
7x=36
x=36/7
x=5,14

c) 2/4=6/x+6
2x+12=24
2x=24-12
2x=12
x=12/2
x=6

d) 7/6=2/y-7
7y-49=12
7y=12+49
7y=61
y=61/7
y=8,7

e) -7/6=8/y+3
-7y-21=48
-7y=48+21
-7y=69
y=69/-7
y=-9,8

f)-5/x+4=5/4
5x+20=-20
5x=-20-20
5x=-40
x=-40/5
x=-8

espero ter ajudado