Someone took a taxi and spent 14.8 yuan. How many kilometers did he drive?
A: Price = 10+4.8.
Corresponding mileage = 3+ 4 =7 kilometers.
2. There is a six-digit abcde 1, which is multiplied by three to become abcde 1. Find this six-digit number.
A: 142857
3. Assuming that the solutions of the equations 4x+2m=3x+ 1 and 3x+2m=6x+ 1 about X are the same, find the value of (1) m.
(2) The algebraic expression (m+2) multiplied by the power of (2m- 7/5) multiplied by the power of 2003.
A:
(1) x =1-2m = (2m+1)/3, so m=0.5.
(2)(m+2)^2002 *(2m-7/5)^2003=(2.5)^2002 *(-0.4)^2003=-0.4
A long time ago, a poor farmer met a devil on the road. The devil grabbed the farmer's clothes and said, "You have a lot of money!" " "The farmer replied," To tell you the truth, I am so poor that I have only a few coppers in my pocket. The devil said, "I have an idea that will make you rich easily." As long as you cross the bridge behind me, your money will double, and it will double every time you walk, but you must promise that you will give me 24 copper coins every time you double it, or I will kill you. " The farmer waved and said, "All right! "The first time I crossed the bridge, I doubled the bridge and gave the devil 24 coppers. The second time I doubled it and gave the devil 24 coppers. After crossing the bridge for the third time, the money doubled as usual, but only 24 copper coins were added, all of which were taken away by the devils. So how many copper coins did the farmer have before he met the devil?
A: Before crossing the bridge for the third time, there were 24/2= 12 copper coins;
Before crossing the bridge for the second time, there were (12+24)/2= 18 copper coins;
Before crossing the bridge for the first time, there were (18+24)/2=2 1 copper coins, that is, the number of copper coins before meeting the devil.
Someone asked Lao Zhang how old his son was. He said, "My son is five times older than my daughter, my wife is five times older than my son, and my wife is twice older than me. If we add up the ages, it happens to be my grandmother's age. He is 8 1 year old this year. " Do you know how old Lao Zhang's son is?
A: Son =5* daughter;
Wife =5* son =25* daughter;
Lao Zhang =2* wife =50* daughter;
Daughter+son+wife+Lao Zhang =8 1* Daughter =8 1, so daughter = 1 and son =5 years old.
6. Xiaoli goes to the supermarket to buy things. Xiao Li bought drinks, hamburgers and some snacks. If she buys more than twice as many snacks as hamburgers, and 2 yuan costs 50 cents, and drinks are more expensive than hamburgers, she spends 34 yuan and asks Xiaoli how much are hamburgers, drinks and snacks?
Answer: Hamburg =(34-3-2.5)/4=7. 125 yuan.
Snacks = 7.125 * 2+2.5 =16.75 yuan.
Drinks = 7.125+3 =10.125 yuan.