Question

15.
a)daca x/5=12/15, atunci............. adica x=.........
b)Daca 3/x=21/35 atunci.......... adica x= .........
c) daca 15/60=x/12, atunci..........adica x=........
d) Daca 36/18=10/x atunci.............adica x=.........​

Answer 1

Răspuns:

Explicație pas cu pas:

a)  x/5 = 12/15 <=> 15·x = 5·12 => x = 5·12:15 =>

x = 60:15 => x = 4

sau : ³⁾x/5 = 12/15  => 3x = 12 => x = 4

b)  3/x = 21/35 <=> 21·x = 3·35 => x = 3·35:21 =>

x = 105:21 => x = 5

c) 15/60 = x/12 <=> 60·x = 12·15 => x = 12·15:60 =>

x = 180:60 => x = 3

d) 36/18 = 10/x <=> 36·x = 10·18 => x = 180:36 =>

x = 5