Don't speak loudly in the library

Don't speak loudly in the library

Don't speak loudly in the library.

We should pay attention not to speak English loudly in the library
we should————talk loudly in the library.
We finished the rice
we have———the rice
The first four empty, the second three empty

We should take care not to talk loudly in the library.
We have eaten (mopped) up all the rice.
Note: eat up and mop up both mean eat up, the latter is more colloquial

Don't speak loudly in the library

Don't speak loudly in the library

The distance between a and B is 360 km. The passenger car and freight car start from a to B at the same time. The speed of the freight car is 60 km / h, and that of the passenger car is 40 km / h. after arriving at B, the freight car stops for 0.5 hours and returns to a at the same speed. If it meets the passenger car on the way, the distance from a station is ()
A. 300 km B. 280 km C. 320 km D. 276 km

Suppose the bus runs for X hours at the time of meeting. According to the meaning of the question, there is 60 (x-0.5) + 40x = 360 × 2, and the solution is x = 7.5, 40 × 7.5 = 300 (km). Answer: the distance from station a is 300 km at the time of meeting

What is the difference between projection and projection in mathematics?

Team a and team B built a road together. When they finished the task, team a built 815% of the road. If team B finished it alone in 24 days, how many days did team a finish it alone? (Qingshan District, Wuhan City)

The working time of team a and team B: (1-815) △ 124, = 715 × 24, = 565 (days); team a does it alone for several days: 1 △ 815 △ 565, = 1 △ 121, = 21 (days). Answer: team a does it alone for 21 days

How many natural numbers can be taken out from 1.2.3.2004, so that the difference between the two numbers is not equal to 4? The answer is 1004, not 1002

From the natural numbers of 1.2.3.2004, up to 1004 numbers can be taken out, so that the difference between each two numbers is not equal to 4
The method is as follows: from 1 to 2004, take 4 and leave 4 in order, and the total number obtained is 1004 as follows:
1.2.3.4,9.10.11.12,17.18.19.20,…… ,2001.2002.2003.2004 .

1. The speed of a passenger car is 60 km / h, and that of a freight car is 45 km / h. The freight car is 135 m longer than the passenger car. If two cars are in parallel, the speed of a passenger car is 60 km / h, and that of a freight car is 45 km / H
2. In summer, in order to save electricity, we often take two measures: increasing the set temperature of air conditioner and cleaning the equipment. A hotel first increases the set temperature of air conditioner a and B by 1 ° C. as a result, air conditioner a saves 27 ° more electricity than air conditioner B every day. Then we clean the equipment of air conditioner B, so that the total electricity saving of air conditioner B is 1.1 times of that of air conditioner B after the temperature is only increased by 1 ° C, However, the power saving of type a air conditioner remains unchanged, so that the two air conditioners can save 405 degrees of power every day. How much power can each air conditioner save every day when the temperature is only increased by 1 ° C?
3. From a to B, go down the mountain first and then take a level road. Someone goes down the mountain by bicycle at the speed of 12km / h, and passes through the level road at the speed of 9km / h. It takes 55min to get to B. when he comes back, he goes through the level road at the speed of 8km / h, and goes up the mountain at the speed of 4km / h. It takes 1.5h to return to A. how many kilometers are there from a to B?
4. In order to improve the conditions of running a school, the school borrowed 2 million yuan from the bank to build the experimental building. The annual interest rate of the loan is 5.2%, and the depreciation rate of the house is about 2% every year. There are 1440 students in this school, so the loan interest and depreciation are two items
How much is the annual experimental fee for each student?
It's a linear equation with one variable!

2. Set B to increase the temperature by one degree and save x degrees of electricity every day
（X+27）+1.1X=405
2.1X+27=405
2.1X=378
X=180
X+27=180+27=207
A: when the temperature is raised by one degree, B will save 180 degrees a day and a 207 degrees a day

Given that positive integers a, B, C satisfy a ＞ B ＞ C, and ab + BC + Ca = ABC, find all qualified a, B, C

ab+bc+ca=abc
Divide by ABC at the same time
1/c + 1/a + 1/b = 1
because
a > b > c
therefore
1/a 1/2b
4 > b
b = 3 or 2 or 1
The meaning of the title
b = 3
1/c + 1/a + 1/b = 1
1/2 + 1/3 + 1/a =1
1/a = 1/6
a = 6
So a = 6, B = 3, C = 2

A and B set out from a and B respectively and went opposite each other. When they met, 55% of a's journey was more than 3.5 kilometers. B just walked 12 times of a's journey. How many kilometers did B travel when they met?

3.5 △ (21 + 2-55%) × 13, = 3.5 △ (23-1120) × 13, = 3.5 △ 760 × 13, = 3.5 × 607 × 13, = 10 (km); a: B traveled 10 km when he met