ajutati maaaaa ex 10

Răspuns:
...a) 10/5=8/14 x= 14×10/8=17,5 cm
b) (15-x)/15=6/10(15-x)/3=3
15-x=9. x=6cm
c) X/ (x+16)=6/18=1/3
3x=x+16
2x=16
x=8cm