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A and B two trains from 450 kilometers away from the two places at the same time, after five hours just met, known a and B two car speed ratio is 4:5, two trains every hour how many kilometers? Tell me why? Good 50 minutes!
450 △ [(4 + 5) × 5] = 10 A: 4 × 10 = 40 km / H B: 10 × 5 = 50 km / h
It's about 126 km from a to B. a car and a freight car leave from ab at the same time. After 45 minutes, when they meet, the car travels 6 km more than the freight car
Suppose that the car has traveled x km and the truck (x = 6) km, so x + X + 6 = 126, x = 66
66 divided by 0.75 = 88 km / h
The passenger and freight cars leave from AB in 4.5 hours. The passenger car runs 27 kilometers more than the freight car. The speed of the freight car is 4 / 5 of that of the passenger car
Set bus x km / h
4.5x-4.5x×4/5=27
0.9x=27
x=30
The distance is 30 × 4.5 + 30 × 4.5 × 4 / 5 = 243km
Passenger car speed 5x freight car speed 4x 4.5 * (5x-4x) = 27 x = 6 the distance between the two places is 4.5 * (5x + 4x) = 243
The speed ratio of freight cars to passenger cars is 4 to 5. The two cars leave from a and B and meet at 18 kilometers from the midpoint. How many kilometers are there between a and B
Note: the midpoint is not the end point, the midpoint is half of the whole process
If we meet at 18 km from the midpoint, the bus will travel 18 + 18 = 36 km more than the truck
The distance between the two places is 36 ± (5-4) / (5 + 4) = 324km
1. How can we get 24 or - 24 by mixing 2, 2 and 3 with rational numbers?
(2+1)
3*2
3 times 2 to the third power, and the third power is 2 + 1
Three cars can transport 8 tons at a time. How many times do you need to transport 192 tons of goods?
one hundred and ninety-two-eighths
When the students went on an outing, the teacher asked Xiao Ming to buy a bottle of mineral water for each of the 70 children. The supermarket is promoting the sale: four for one, how many bottles does Xiao Ming only need to buy?
[70 / (4 + 1)] * 4 calculate the result by yourself
The speed ratio of truck and bus is 3:4. The two cars leave from station a and station B at the same time and meet at 18 kilometers away from the midpoint. How many meters is the distance between station a and station B? Use the equation to solve the problem, and I will do the arithmetic
Let the meeting time be X
4X-3X=18*2
X=36
Distance between the two places: 36 * (4 + 3) = 252km
Because the speed ratio of the truck to the bus is 3:4, the driving time of the two cars is the same, so the driving distance of the two cars is also 3:4. If the distance of freight car is s, the distance of passenger car is 4 / 3S.
Because the two cars meet at 18 km from the midpoint of the two stations, the bus is faster, so the distance of the bus is s total / 2 + 18 km, the distance of the truck is s total / 2-18 km, and the distance difference between them is 18 km x2.
So 4 / 3s-s = 18x2
S = 108 (km)
S total = 4 /... Expansion
Because the speed ratio of the truck to the bus is 3:4, the driving time of the two cars is the same, so the driving distance of the two cars is also 3:4. If the distance of freight car is s, the distance of passenger car is 4 / 3S.
Because the two cars meet at 18 km from the midpoint of the two stations, the bus is faster, so the distance of the bus is s total / 2 + 18 km, the distance of the truck is s total / 2-18 km, and the distance difference between them is 18 km x2.
So 4 / 3s-s = 18x2
S = 108 (km)
S total = 4 / 3S + S = 7 / 3S = 7 / 3x108 = 252 km
There is a "24 point" game, the rule is: take any four rational numbers (each number is used and only once) to carry out the mixed operation of rational numbers, so that the result is equal to 24
(1) There are four rational numbers 3.4. - 6,10. Using the above rules, write at least two different formulas to make the result equal to 24
(2) There are also four rational numbers 3, - 5,7,13. Use the above rules to write a formula so that the result is equal to 24
3*[-(-10)-6-(-4)]=24
4-(-10)*(-6)/(-3)=24
(-(10)-4)-3*(-6)=24
(（-5）×（-13）+7)÷3=24
The truck team carries a batch of goods. If each truck is loaded with 4 tons, there are still 8 tons left. If each truck is loaded with 4.5 tons, just after loading, how many cars are there in the truck team?
4X + 8 = 4.5X x = 16 vehicles
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