When several 8-ton trucks are used to transport goods, each truck is only loaded with 5 tons, and the remaining 10 tons are loaded with 8 tons, the last truck is not empty. How many trucks are there If the number of unsatisfied non empty fingers does not reach the specified number, the non empty fingers are greater than zero

When several 8-ton trucks are used to transport goods, each truck is only loaded with 5 tons, and the remaining 10 tons are loaded with 8 tons, the last truck is not empty. How many trucks are there If the number of unsatisfied non empty fingers does not reach the specified number, the non empty fingers are greater than zero

three

The total weight of a pile of goods is fixed. Is the carrying capacity of each vehicle proportional to the number of vehicles? Why?

The quotient between two quantities must be in positive proportion. If it is a product, it must be in inverse proportion
The carrying capacity of each vehicle × the number of vehicles = the total weight of a pile of goods (certain), so the carrying capacity of each vehicle is not in direct proportion to the number of vehicles, but in inverse proportion

Good score: as shown in the figure, a truck with a width of 2 meters has to pass through a span of 8 meters,
As shown in the figure, a truck with a width of 2 meters has to pass through a single parabolic tunnel with a span of 8 meters and an arch height of 4 meters (passing through the center). The parabola satisfies the expression y = - 1 / 4 x ^ 2 + 4. In order to ensure safety, the distance between the roof and the top of the tunnel should be at least 0.5 meters. How much should the height limit of the train be? (accurate to 0.01 meters) don't ask me for a picture

If the height limit of freight car is k m, then (1, K + 0.5) is on the parabola
k+0.5=-1/4*1^2+4,k=3.25
The answer should be accurate to 0.01 meters, and the height limit is 3.25 meters

Can a 2.8m wide road pass a 6.8m long truck?

Absolutely