(1)12﹕15=x﹕60
15x=12×60
15x÷15=720÷15
x=48;
(2)0.8﹕2.4=12﹕x
0.8x=2.4×12
0.8x÷0.8=28.8÷0.8
x=36;
(3)x﹕
=28:1 4
1 6
x=1 6
×281 4
x÷1 6
=7÷1 6
1 6
x=42;
(4)1.5:16=x﹕3.2
16x=1.5×3.2
16x÷16=4.8÷16
x=0.3;
(5)
﹕4 5
﹦2 5
﹕x1 2
x=4 5
×2 5
1 2
x÷4 5
=4 5
÷1 5
4 5
x=
;1 4
(6)
﹕x=2 3
﹕64 7
x=4 7
×62 3
x÷4 7
=4÷4 7
4 7
x=7.