Question

Me ajudem!

a) x/2-x/4=5
b) x/5+x/2=7/10
c) x/5+1=2x/3
d) x/2+x/3=1

Answer 1

a)

x/2-x/4=5

MMC (2,4) = 4

(2x - x)/4 = 4.5/4

x = 20

b)

x/5+x/2=7/10

MMC (5,2,10) = 10

(2x + 5x)/10 = 7/10

7x = 7

x = 7/7

x = 1

c)

x/5+1=2x/3

MMC (5,3) = 15

(3x + 15.1)/15 = 5.2x/15

3x + 15 = 10x

15 = 10x - 3x

15 = 7x

7x = 15

x = 15/7

d)

x/2+x/3=1

MMC(2,3) = 6

(3x + 2x)/6 = 6.1/6

5x = 6

x = 6/5