(1) What's the fare for a 5 km taxi?
(2) The taxi passenger pays 95 yuan Angle, and the passenger says the taxi mileage (accurate to one decimal place).
Solution:
⑴
Set the above 4 km mileage.
Total cost = 10.4+1.6.
X = 5-4 = 1
Total cost =10.4+1.6 =10.4+1.6 =12.
(2)
95.2 10.4 + 1 1 * 1.6
So it exceeds 15km, and the total mileage is XKM.
95.2 = 10.4 + 1 1 * 1.6 +(- 15)* 2.4
X =43 kilometers
The summer when the principal of a school and the municipal miyoshi students go to Beijing will lead to the school. The travel agency said: "If the principal buys students with the same rest, he can enjoy a half-price discount." The travel agency said: "All safe fares are 60% off (that is, 60% off the ticket surcharge), including the principal, and the whole fare is 240 yuan."
(1) After calculating the charges of two travel agencies, Justice found that the total expenses of their trips were the same. How many "three good students" are there at the school level?
(2) If students can't travel to Beijing, imagine: is there a discount for travel agencies?
(1) Group X students
240+ 120 X =(X+ 1)* 240 * 0.6
X = 4 people
4 * 240 * 0.6 = 576
Choose b travel agency.
Games and prizes were bought by Chen School. When he returned to school logistics, Wang called Zhang: "The unit price of the book I bought was 8 yuan and 105 yuan. Before I distributed the books, I brought $65,438 +0.5 million, which is not less than $465,438 +0.8 million. " Wang calculated. "
Mr. Wang said that he had made a mistake. Why? Explanatory knowledge of trial equation;
(2) Teacher Chen quickly took out enough purchase invoices and found that there was a mistake, because he also bought a laptop, but the unit price of the laptop was blurred. Is it possible to use only the integer of 10 as the unit price of a small notebook?
Solution: this book is located at12×105-xbr/>; 12X+( 105-X)* 8 = 1500-4 18
X = 60.5 is not an integer.
It must be wrong.
60 * 12 +45 * 8 = 1080
1500-4 18- 1080 = 2
If you buy more 8 yuan, you can buy less 12 yuan.
46,59, 12, total amount = 46 * 8 +59 * 12 = 1076.
1500-418-1076 = 6 yuan.
The unit price of the notebook may be 2 yuan or 6 yuan.
4。 Uncle Wang wants to go to the bookstore to buy books. When asked, he saw an advertisement: hope bookstore membership card, 20% discount on textbooks. Uncle Wang, the bookstore charges 20 yuan for a membership card. How much is it worth for Uncle Wang to set up a textbook card?
Let x be many.
X-20 = 0.8 times
X = 100