Question

Calcule mentalmente o valor de X a) 3/15 = x/5b) 8/x = 12/3c) x+1/5 = 8/10d) x-2/7 = 3/7

Answer 1

Resolução!




A )

3/15 = x/5 =

15x = 3 * 5

x = 15/15

x = 1




B )



8/x = 12/3


12x = 3 * 8

x = 24/12

x = 2





C )



x + 1 / 5 = 8/10


10x + 10 = 40

10x = 40 - 10

x = 30/10

x = 3






D )



x - 2/7 = 3/7


7x - 14 = 21

7x = 21 + 14

x = 35/7

x = 5





espero ter ajudado