路程(km)
0
50
100
150
200
250
…
耗油量(L)
5
10
15
20
25
500-213= 10÷10%= 0.25+2.83= 1.25×0.8= 3.7-3.7÷3.7=
92-33= + = × = 9÷ = ( - )×20=