68+32= 10-0.6= 1.25×80= 0.8÷0.04=
2.4÷ = × = 5×8%= ÷ =
0.3:x= :51
2x+3×0.9=24.7
时间/天
1
2
3
4
……
生产总量/吨
80
160
240
560