Elementary School Math Problems Thank you so much!!

For the next 18 minutes, the irrigation height is:

50-20 = 30 cm.

The first 3 minutes should be watered:

30 3 18 = 5 cm.

Now the actual irrigation height is 20 cm.

This is because the rectangular iron block reduces the bottom area of the container.

The ratio of the bottom area of the part that can hold water to the bottom area of the cylinder is:

The ratio of the base area of the box to the base area of the cylinder is:

One person, one day can process it:

135 (2*5-1)=15.

As for five people, one day can process it:

15 5 = 75.

The rest still need to:

735-135) 75 = 8 days.

If you can fill (50-20) a 30 cm high cylinder in minutes, it will take only 12 minutes for a 20 cm high column.

And those 3 minutes were filled with a 20-centimeter cylindrical rectifier.

Let the rectangular background area be a and the cylinder be b, then 20b (20b—20a) b (b-a) 12 3

Then out 12b—12a 3b, then a:b 3:42. Set each worker to process x.

Then (2*5-1)x=135,x=15 so (735-135) 15=40,40 5=8 days.

The first one won't.

Person. 10-1=9 people.

135 9 = 15.

735-135 = 600 pcs.

600 15 5 = 8 days.

A: It will take another 8 days to complete the task.

The bottom area of the cylinder is S1 and the bottom area of the box is S2

Volume of water for 3 min = (s1-s2)*20

Volume of water for 18 min = s1 * 30

So s1*30 (s1-s2)*20=6s2:s1=3:4

Set the working efficiency to process x per person per day.

So 5*x+4*x=135

x=15 After each person takes leave, 15*5=75 can be processed per day.

There are 735-135 = 600 left.

So it takes 600 75=8 days.

1'After another 18 minutes, the water filled the cylindrical container, at this time the height of the injection is 30cm, that is, the original filling of 20cm is applied for 12 minutes, and the iron block of a rectangular body is filled with water for 3 minutes, that is, it takes 9 minutes to fill the iron block of the cuboid. With the same height of 20cm and a volume ratio of 9:20, the ratio of the bottom area is:

3；42'Suppose a person processes x pieces a day, 9x=135, x=15. （735-135）/(15*5)=8

It will take another 8 days to complete the task.

It is obtained by simplifying the distance from m to the common tangent line.

The denominator is 6

Multiply the sides of the equal sign by 6 to get the style of the example problem

The different combinations of the three fruits of apples, oranges, and pears are 3

6+1=7.

At least 7 children were given the same fruit.

Hello: There are 6 situations in total.

3+1=4.

A: At least 4 children get the same fruit.

Total value: 18 6 + 25 4 + 28 2 = 108 + 100 + 56 = 264 yuan.

Total weight: 6 + 4 + 2 = 12 kg.

Unit price: 264 12 = 22 yuan.

Integer: (18 6 + 25 4 + 28 2) (6 + 4 + 2) = 22 yuan.

The total cost is 18 * 6 + 25 * 4 + 28 * 2 = 108 + 100 + 56 = 264 yuan.

The total weight is 6+4+2=12 kg.

So the unit price of assorted sugar is 264 12 = 22 yuan kg.

Total**=18*6+25*4+28*2=108+100+56=264 yuan.

Total mass = 6 + 4 + 2 = 12

Unit price = 264 12 = 22 yuan kg.

Average**:

Total price: 18 6 25 4 28 2 = 264 (yuan) total kilograms: 6 + 4 + 2 = 12 (kilograms).

Assorted sugar**: 264 12 = 22 (yuan).

Wrong. c is equal to the circumference, the length is a, and the width should be b

solution, x 2-2x+3=(x-1) 2+2 2 then a 2-2a-1<2

then (a-3)(a+1)<0

then a (-1,3).

Analyze, find the minimum f(x), and then solve the inequality.

I don't know, why do you want to draw the inequality in the end, but it has already become (a+1)(a-3)<0 in the end, and directly solve -1< a<3.

What is a calculation? What is an equation? Please let me know, thanks.