(1) | (2) | (3) | (4) | (5) |
A | B | C | C | B |
(1) | (2) | (3) |
× | √ | × |
6∶15=x∶20
15x=120
x=8
|
3/4∶x=3:8
3x=6
x=2
|
0.5/x=0.75/6
0.75x=3
x=4
|