x:=0.5: = 0.2x-1.5=
3.75:x=3:12 (x-0.6)× =2.25 25%: =x:
x÷=4 x+60%x=22 3.6 :1.2=
路程/km
10
20
30
40
50
……
耗油量/L
1
2
3
4
5