A 5th grade math problem, everyone help to do it?

It doesn't matter, since the topic is out, it should be able to be solved.

Let's set the flat land long x, the mountain long y, all we want is 2 (x + y) then go back and forth twice on the flat land, once uphill (mountainous), once downhill (mountainous), a total of 6 hours.

Column equation: x 4 + x 4 + y 3 + y 6 = 6 simplification is easy to get x 2 + y 2 = 6, that is, x + y = 12 so that we can find the distance they have traveled.

They walked a total of 12*2=24 kilometers back and forth this time.

Is it okay to solve it this way? I don't know if you can use this method at the moment

If it doesn't work, call me again, and I'll do my best.

Set a flat road x km. Y km of mountain roads. A total of 2 (x+y) kilometers were walked.

x/4+y/3+x/4+y/6=7-1

x/2+y/2=6

x+y=12

They walked a total of 12 * 2 = 24 kilometers.

Set the flat land length x, the mountain length is y, what we ask for is 2 (x + y) then go back and forth twice on the flat land, one uphill (mountainous), one downhill (mountain), a total of 6 hours.

Column equation: x 4 + x 4 + y 3 + y 6 = 6 simplification is easy to get x 2 + y 2 = 6, that is, x + y = 12 so that we can find the distance they have traveled.

They walked a total of 12*2=24 kilometers back and forth this time.

When going to the flat road with time t1, up the hill t2

The road back to the flat takes time t1, down t2 2

So there is 2t1+3t2 2=6

Distance s=8t1+6t2=4*6=24 km.

Although the upstairs is all right, it should start from the essence of the problem, so that the child can see it simple and clear. I'll talk about the idea casually.

1.A total of 24 kilometers were walked.

2.Because the average speed of the mountain is equal to the speed of the flat land, because you have to go down the mountain and return the same way, because the speed of the descent is twice that of the uphill (it can be calculated in three parts or three hours, three parts are too abstract), so the easiest way is that you use three hours to go up and down the mountain, and it must take two hours to go up the mountain and one hour to go down, so: average speed = (2*3+6) 3 = 4 kilometers per hour, so no matter how you walk, you can only walk 24 kilometers in theory.

3.If you have learned the equation, it will be easier (because I am too old to know whether I have learned in the fifth grade), let's say: when you go to the flat land, you will walk for x hours, and you will come back for x hours; I walked for y hours when I came back and went down the mountain, and I must have walked 2y hours up the mountain when I went.

The total time is (7-1)=6 hours, then x+x+2y+y=6, i.e., 2x+3y=6;Total distance traveled = 4 * x + 2y * 3 (distance traveled when going to) + 6 * y + 4 * x (distance traveled when returning) = 8x + 12y = 4 (2x + 3y) = 4 * 6 = 24 km.

Note: The previous solution is clear and straightforward; The latter solution is long but clear, and for good reason. It would be helpful to think logistically ...

The time taken for a one-way walk on flat ground is x hours.

4x+3*(x=

If the length of the mountain road is x, then the length of the flat road is.

6－（x／3＋x／6））＊4

The total distance is: 2x (6 (x 3 x 6)) 42x (6 x 2) 4 (km).

I remember that I should have learned equations in 5th grade, but this problem does not use equations, just set three unknowns and use a little skill. Let the flat road length x, the uphill road length y, the downhill road length z, and the column equation:

2*（x/4）+y/3+y/6+z/6+z/3=7-1=6

Solve x+y+z=12, so a total of 24 kilometers have been traveled.

For each edge cut off, there are 3 more edges, so there are 3 more edges and corners in total.

Originally, there were 12 edges, so there were 12 + 24 = 36 (lines).

That is, this cuboid also has 36 edges.

The salesperson miscalculated. Because when using "jiao" as the counting unit of payment, the salesman calculates 10 yuan 1 jiao = 101 jiao, which is an odd number, and the price of 3 pencils is 12 jiao, which is an even number; The price of a ballpoint pen is 28 jiao, which is an even number; The remaining 8 notebooks and 12 erasers are all even, so the price must be even, so the total price of the four stationery should be even (in "corners", not counting "points"), it cannot be 101 corners.

The question is missing a premise: all items ** are accurate to the corner (no fractions), so the salesperson miscalculated.

Yuan) = 61 (corner), which is an odd number, while the sum of 8 notebooks and 12 erasers is an even number.

First of all, the units are unified.

4 jiaoyuan, 2 yuan, 8 jiaoyuan, 10 yuan, 1 jiao.

(Note*: Titled as a distraction error, one less premise is missing - all items** are accurate to the corner.) If there are no prerequisites, the following calculations are correct. ）①=

Yuan) because the amount of money left before the payment is odd and prime, and 8 (this notebook) + 2 (eraser) = 10 (the sum of the two things) is an even number, so the salesperson miscalculated.

1. This question knows the length of the upper and lower bottom of the trapezoid, and only the height of the trapezoid is required, and the trapezoidal area can be found.

2. The yellow circle part is 3*4 5 = cm, which is high. It is found by the triangle ade. Because the height of the AD side is the height of the trapezoid.

3. To find the height of the AD side, it is to use the area of the triangle ADE.

The triangle ade is a right-angled triangle with an area of ae*de 2=3*4 2. Similarly, the area of the triangle ADE can also be found by the height 2 of the ad*ad side, which should = 5*2

3*4 2=5*High 2

High = 3*4 5.

So you can find the trapezoidal area.

Hello, happy to answer your questions. Figure also.

120 3 = 360 km.

360+60) 2=210 km.

Piece of cake.

dissolution; ab The two places are x kilometers apart, according to the title:

x-120=The distance traveled by B.

x-60 = distance traveled by A.

A + B = total distance.

x-120+x-60=x

x = 180 A: AB The two places are 180 kilometers apart.