⑴ | 1/20000 20000 |
⑵ | 600 |
⑶ | 1∶8000 |
⑷ | 100∶1 |
⑴ | ⑵ | ⑶ |
C | B | C |
8∶2.5=x∶0.5
2.5x=8×0.5
x=1.6
|
5/12∶x=1/5∶9/20
1/5x=5/12x9/20
x=15/16
|
26/1.3=4/x
26x=5.2
x=0.2
|