Question

Aplique a regra de três e encontre o de x:
a) 1/2= x/5+x
b) x+2/2 = 10/5
c) 1/x-3 = 4/x
d) x/3 = x-2/5

Answer 1

a. 1(5+x)=2x
5+x=2x
2x-x= 5
x=5

b. 5(x+2)=20
5x+10=20
5x=20-10
5x=10
x= 10/5
x=2

c. x= 4(x-3)
x= 4x-12
4x-x = 12
3x = 12
x=12/3
x= 4

d. 5(x)=3(x-2)
5x= 3x-6
5x-3x= -6
2x= -6
x= -6/2
x= -3

Answer 2

a) 1/2 = x/(5+x)      5+x= 2x   x = 5
b) (x+2)/2 = 10/5     (x+2)/2 = 2     x+2 = 4  x = 2
c)1/(x-3) = 4/x      x = 4(x-3)      x =  4x-12     3x = 12     x= 4
d)x/3 = (x-2)/5    5x = 3(x-2)   5x = 3x-6      2x = -6   x = -3

Espero ter ajudado  ;)