If you answer well, add it again! Use the equation! (it's better to use the equation of one variable once) According to statistics, from October 11, 2008 to February 28, 2009, the total daily average passenger volume of ground bus and rail transit was 16.96 million person times, and the daily average passenger volume of ground bus was 4 times less than that of rail transit by 690000 person times, The average daily passenger volume of ground bus and rail transit, how many million people do you have? The basic price of household electricity in a city is 0.4 yuan per kilowatt hour. If the monthly electricity consumption exceeds a kilowatt hour, 70% of the basic electricity price will be charged (1) A household uses 84 degrees of electricity in May and pays 30.72 yuan in total. How much is a? (2) If the average electricity charge in June is 0.36 yuan per kilowatt hour, how many kilowatt hours does the household share in June and how much electricity charge should be paid?

If you answer well, add it again! Use the equation! (it's better to use the equation of one variable once) According to statistics, from October 11, 2008 to February 28, 2009, the total daily average passenger volume of ground bus and rail transit was 16.96 million person times, and the daily average passenger volume of ground bus was 4 times less than that of rail transit by 690000 person times, The average daily passenger volume of ground bus and rail transit, how many million people do you have? The basic price of household electricity in a city is 0.4 yuan per kilowatt hour. If the monthly electricity consumption exceeds a kilowatt hour, 70% of the basic electricity price will be charged (1) A household uses 84 degrees of electricity in May and pays 30.72 yuan in total. How much is a? (2) If the average electricity charge in June is 0.36 yuan per kilowatt hour, how many kilowatt hours does the household share in June and how much electricity charge should be paid?

1. Assuming that the daily passenger volume of rail transit is x 10000 person times, then the daily traffic volume of ground bus is 4x-690000 person times, then the total daily traffic volume is x + 4x-69 = 1696, that is, 5x-69 = 1696
The solution is x = 3.53 million, so the daily passenger volume of rail transit is 3.254 million, while the daily traffic volume of ground bus is 3.54 million
4 * 353-69 = 13.43 million,
2. (1) the unit price of the first part is 0.4 * 70% yuan per degree
Then the equation can be 0.4A + 0.4 * 0.7 * (84-A) = 30.72
0.4a+0.28*84-0.28a=30.72
0.12a+23.52=30.72 0.12a=7.2
The solution is a = 60
(2) The average is 0.36 yuan per kilowatt hour < 0.4 yuan per kilowatt hour, indicating that the electricity consumption in June also exceeded a = 60 degrees
First of all, the average price in question 1 is
30.72/84 = 0.366 yuan per kilowatt hour, that is to say, the average price is the total electricity charge divided by the total electricity consumption}
Therefore, assuming that the total electricity consumption in June is y degree, the total electricity charge should be 0.36y
The equation is as follows:
0.4*60+0.4*0.7*（Y-60）=0.36Y
24+0.28Y-16.8=0.36Y
0.08y = 7.2, y = 90
So the total electricity consumption in June is 90 degrees, and the electricity charge is 0.36 * 90 = 32.4 yuan
I hope you can see this explanation clearly!