2. no.
3. The functional relationship between m and n: m=n/ 100.
If the average daily electricity consumption is 4 degrees, that is, n=4, then m=4/ 100=250 (days).
4. Fill in the first line in turn: 4,3/10,2,13/20,4/5,9/10;
Fill in the second line in turn: 100, 50, 3/ 100, 25.
6、⑴t=u/ 1200
(2) According to the meaning of the question, 60 employees can put up to 300 tons of rice every day, that is, u=300 tons/day. If n/ 1200 is substituted, t=300/ 1200=4 (days).
(3) According to the meaning of the question, the corn left by employees after two days of continuous work is 1200-2×300=600 tons.
Suppose x people are needed to complete the task. 60/300×(60+x)=600 x=60。
7、⑴a=b/70
(2) meaningful; Xiao Wang has consumed oil since he arrived in the county: 300×0. 1=30 liters, and there is still oil in the tank; 70-30=40 liters, and the oil required for the return trip: 300×0.2=60 liters > 40 liters, and 60 liters -40 liters =20 liters.
So the oil in the tank is not enough to return to the county seat, and at least 20 liters of oil is needed.