(1)9:
1
2 =x:14,
1
2 x=9×14,
1
2 x×2=126×2,
x=252;
(2)9:4.5=(x+6):8
4.5×(x+6)=9×8,
4.5×(x+6)÷4.5=72÷4.5,
x+6-6=16-6,
x=10;
(3)
1
8 :x=
1
10 :
1
3 ,
1
10 x=
1
8 ×
1
3 ,
1
10 x×10=
1
24 ×10,
x=
5
12 ,
(4)x÷
6
13 =3.25×3.5,
x÷
6
13 =11.375,
x÷
6
13 ×
6
13 =11.375×
6
13 ,
x=5.25.