A few questions from the first year of junior high school

Set the current speed to x km/h.

312/x=154/ +

x=80

A: 200km h

Set the time to maintain order x minutes.

If order is not maintained, Mr. Wang has to wait 36 3 = 12 minutes to pass Now 6 minutes in advance, it means that he only waited 12-6=6 minutes In these 6 minutes, it took x minutes to maintain order, through 3x people, and then (6-x) minutes to wait according to normal order, passed 9 (6-x) people, a total of 36 people passed, so 3x+9(6-x)=36

Solution x = 3 minutes.

Suppose a certain book is bought x copies, then the other books are 105 copies, 8x+12(105-x)=4*[2x+3*(105-x)] Therefore, the purchase price should be an integer multiple of 4, and the purchase price of the book that Mr. Wang said is 1500-418=1082, not an integer multiple of 4, therefore, it must be wrong.

Set the unit price of the notebook to Y yuan.

8x+（105-x）*12+418+y=1500y=4x-178

0<4x-178<10

178<4x<188

x=45,46

y=2 or y=6

1.Solution: Let the current speed be x, then: (312 x) = 154 ( +

After solving x, the design speed is (

1, d2, set B to C x cards, from the title: n-2 + x = 2n, find out x = n + 2 so B is now in the hand of the card n + 4 + 2 - (n + 2) = 4

3. If the ten digits are x, then the number on the hundred digit is x+2, and the digits are 24-(x+2)-x=22-2x. From the meaning of the title:

x+2)*100+10x+(22-2x)]-10*(x+2)+(x+2)]=100*(22-2x)+10x+(x+2) The solution is x=7, so the original number is 978

4. They are all hypocrites.

When the windless speed is set to x km/h.

x=600 distance: (600-20) km.

Speed: 600km h

Let the velocity be x when there is no wind

x 600 A: The speed is 600km h.

Distance: A: The two places are 1798km apart.

If you don't understand, you can ask!

The speed of the aircraft is xkm h when there is no wind, according to the title.

Solve x 600

Answer; The speed of the aircraft when there is no wind is 600km h and the distance between the two cities is 1798km.

Let the speed of the aircraft be v. when there is no windColumn equation: v=600

Distance between the two cities=

A = 90 degrees, B = 135 degrees, C = 75 degrees, on a scale of 1:10000, Ma is centimeter, AB is 2 centimeters, BC is 3 centimeters, and NC is 2 centimeters. Take a ruler and a protractor to draw it, and then connect the mn, use a ruler to measure the distance on the map (there may be differences in the results measured by different people, a little error is inevitable), the actual distance is multiplied by 10,000, and the centimeter should be converted into meters and then divided.

I think I draw it first, then measure it with a ruler, and finally restore the scale bar to calculate the actual distance, A is 90 degrees, B is 135 degrees, and C is 75 degrees. I'm also a freshman in junior high school, hehe.

This one seems to be in kindergarten, and I saw it when I was in kindergarten.

First, multiply the respective multipliers in parentheses to okkkkkkkkkkkkmk.

1.-6, the smallest number must be negative, the two numbers must be positive and negative, and the absolute value of the division is the largest, that is 6 and -1.

2.Loss.

The purchase price of profit is 60 125% = 48 yuan, that is, the profit is 12 yuan.

The purchase price of the loss is 60 75% = 80 yuan, that is, the loss is 20 yuan.

So the overall loss was 8 yuan.

1.Column Name: Political Status.

Content: One of the five members of the Standing Committee of the United Nations, with the growth of national strength, China's status in the international community is getting higher and higher.

3.Cutting in line is a bad behavior, please don't cut in line, thank you!

I hope it can help you, I'm a freshman in junior high school, and I happen to be working on this roll!

New China's hard-won: tells the story of the heroic sacrifices made by the revolutionary ancestors for the founding of China.

Big brother, I am a member of today's supervisory team This theatrical evening is from the first year of junior high school to the third year of high school, and the grades line up in turn, I hope you wait a while, so that the students of the first grade of junior high school In this day of national celebration, I think you have to be willing to do things as required to maintain order in the venue, isn't it.

Divide "x squared + 5x+1" by x, which becomes x+5+1 x=0 to get x+1 x= -5 , x+1 xsquare = x+1 x) squared - 2 = 23

x4 to the power + 1 x 4 to the power = x + 1 x) - 2 = 527

100% accuracy hope 3q