Răspuns :

Hasss30id

Explicație pas cu pas:

3/5=x/10=>x=10*3/5=>x=2*3=>x=6

7/x=21/15 => x=7*15/21=>x=15/3=>x=3

Kawaiimathid

a) 3/5=x/10

3•10=5•x

5x=30 / : 5

x=6

b) 7/x=21/15

7•15=21•x

21x=105 / : 21

x=5

ID Alte intrebari