After 7 hours' meeting, car a is 6 kilometers faster than car B per hour, and the speed is 5; 6. How many kilometers is the distance between two places? Use the equation

After 7 hours' meeting, car a is 6 kilometers faster than car B per hour, and the speed is 5; 6. How many kilometers is the distance between two places? Use the equation

If B is x km / h, then a is (x + 6) km / h, (x + 6) / x = 6 / 5, and the distance between the two places is 7 [(x + 6) + x]
The two trains of a and B leave each other from two cities 2400 kilometers apart. They meet on the way 12 hours after departure at the same time. It is known that the speed of train a is three fifths of that of train B. find out the speed of the two trains
Car a 125km / h
Vehicle B 75KM / h
A and B trains leave from the two cities at the same time. When car a travels 36 kilometers less than car B, the distance between the two trains is 26 km
The two trains of a and B depart from the two cities at the same time. When car a travels 36 kilometers less than car B, the two trains are 264 kilometers apart. It is known that the speed ratio of car a and B is 5:6. How many kilometers are the two cities apart?
The distance that car a takes less than car B is 1-5 / 6 of that of car B = 1 / 6
B = 1 / 216 km
The distance a takes is 216 × 5 / 6 = 180 km
The distance between the two cities is 216 + 180 + 264 = 640 km
The distance between a and B is 360 km. The passenger cars and freight cars leave from a and B at the same time and meet after 2 o'clock. It is known that the speed ratio of passenger cars and freight cars is 5:4,
How many kilometers do buses and trucks travel per hour? Answer quickly
Bus speed = 360 △ 2 × 5 △ 5 + 4 = 100 km / h;
Freight car speed = 360 △ 2-100 = 80 km / h;
Bus distance = 100 × 2 = 200 km;
Truck distance = 80 × 2 = 160 km
What's the problem?
Passenger car
360/(5/(5+4))/2=100
truck
360/(4/(5+4))/2=80
If the speed of the bus is 4x + 2 km / h, then the speed of the bus is 5x + 360 km / h
9x = 180, x = 20 km / h, so the bus is 100 km / h and the truck is 80 km / h
Can we find it by setting x?
Suppose the speed of passenger cars is 5x and that of freight cars is 4x,
Then (5x + 4x) * 2 = 360
Find x = 20
Then the bus runs 5 * 20 km / h = 100 km
The truck runs 4 * 20 km / h = 80 km
﹙2x／3﹚√18x＋x²√﹙2／x﹚+6x√﹙x／8﹚
Original formula = (2x / 3) * 3 √ (2x) + X & # 178; * √ (2x) / x + 6x * √ (2x) / 4
=2x√(2x)+x√(2x)+3x*√(2x)/2
=9x√(2x)/2
=2x√2x+√2x+3x√x/2
=3x√2x+3x√x/2
If it's just a root sign, you can't find it if you only write the left side but not the right side
A company needs to transport a batch of materials to the destination at one time. If M vehicles with a carrying capacity of 5 tons are used for shipment, there are still 21 tons of materials left. If M vehicles with a carrying capacity of 8 tons are used for shipment, the last vehicle only needs to carry 2 tons. (1) calculate the value of M; (2) if both vehicles with a carrying capacity of 5 tons and 8 tons are used for transportation, and the freight of each vehicle with a carrying capacity of 5 tons is 700 yuan The freight of 8 tons car is 1000 yuan, please design a car rental scheme, each car is full and the total cost is the least
(1) 5 m + 21 = 8 (m-1) + 2, and M = 9; (2) suppose x vehicles with 5 tons load and Y vehicles with 8 tons load are used, then 5x + 8y = 66, X and y are positive integers, x = 2Y = 7 or x = 10Y = 2. If 2 vehicles with 5 tons load and 7 vehicles with 8 tons load are used, the total cost is at least 8400 yuan
Xiao Ming and two other students went on a spring outing and bought three bottles of mineral water and a bottle of coke. The price of coke is four times that of mineral water. It costs 10 or 5 yuan. How much is coke
1 bottle of mineral water 10.5 ÷ (3 + 4) = 1.5 yuan
Coke is 1.5x4 = 6 yuan
1 bottle of mineral water 10.5 ÷ (3 + 4) = 1.5 yuan
Coke is 1.5x4 = 6 yuan
2 yuan
If the mineral water is x yuan, then the unit price of coke is 4x yuan
3X+4X=10.5
Solution: X is 1.5, mineral water is 1.5 a bottle, coke is 6 yuan a bottle.
Six
A and B set out at the same time 360 kilometers apart, and they ran in opposite directions. When they were two hours old, they met. It is known that the speed of a car is twice that of B car
Snow, snow,
The two vehicles travel together every hour:
360 △ 2 = 180 (km)
Vehicle B runs every hour:
180 ÷ (2 + 1) = 60 (km)
Vehicle a runs every hour:
60 × 2 = 120 (km)
Second radical calculation in Grade 8
(1 / 5 times root 5) square + (4 / 15 times root 5) square + (2 / 3) square
How much is it? It's a process
solution
The original formula is 1 x 5 of 25 + 16 x 5 of 25 + 4 of 9
=1 / 5 + 16 / 45 + 4 / 9
=45 + 9 / 20
=1
Direct disassembly
Original formula = 1 / 5 + 16 / 45 + 4 / 9
=7/9+4/9
=11/9
If each truck carries 3.5 tons, there will be 3 tons left. If each truck carries 4 tons, it will be finished. How many trucks are there?
If there are x vehicles, then:
3.5x+3=4x
0.5x=3
X=6
So there are six cars
3 ÷ (4-3.5) = 6 vehicles
Hope to help you, mathematics Guidance Group wish you progress in learning, do not understand please ask, understand please timely adopt! (*^__ ^ *
That extra 3T was evenly divided into each car, making each car 0.5T more
3 / 0.5 = 6 vehicles
Let x cars, then from 3.5 * x + 3 = 4 * x of the meaning of the problem, x = 6 is solved. It's like this~