A classmate has to arrive at the place B 15 kilometers away from the place a in four hours. After he started from the place a, he walked at the speed of 3 kilometers per hour for one hour. After that, at least how many kilometers per hour do he have to walk to reach the place B as planned? 2. Put less than 40 chickens into several cages. If there are 4 chickens in each cage, there will be 1 chicken without cage. If there are 5 chickens in each cage, there will be 1 chicken without cage, and the last cage is less than 3. How many cages are there? How many chickens are there? 3. An engineering team originally planned to excavate at least 600 cubic meters of soil in 10 days. In the first two days, it completed 50 cubic meters of soil every day. Due to the adjustment of the construction period of the whole project, it is required to complete the excavation task three days in advance. How many cubic meters of soil will be excavated in the next few days?

A classmate has to arrive at the place B 15 kilometers away from the place a in four hours. After he started from the place a, he walked at the speed of 3 kilometers per hour for one hour. After that, at least how many kilometers per hour do he have to walk to reach the place B as planned? 2. Put less than 40 chickens into several cages. If there are 4 chickens in each cage, there will be 1 chicken without cage. If there are 5 chickens in each cage, there will be 1 chicken without cage, and the last cage is less than 3. How many cages are there? How many chickens are there? 3. An engineering team originally planned to excavate at least 600 cubic meters of soil in 10 days. In the first two days, it completed 50 cubic meters of soil every day. Due to the adjustment of the construction period of the whole project, it is required to complete the excavation task three days in advance. How many cubic meters of soil will be excavated in the next few days?

A classmate has to get to the second place 15 kilometers away from the first place in 4 hours. After he starts from the first place, he walks at the speed of 3 kilometers per hour for 1 hour. After that, at least how many kilometers should he walk per hour to reach the second place according to the plan? If he has to walk at least x kilometers per hour, there are (4-1) x + 1 × 3 > = 153x + 3 > = 15x > = 4

1. Use the square difference formula to calculate:
(1).27×33
(2).5.9×6.1
(3).99×101
(4).1005×995
2. Using the complete square difference formula to calculate:
(1).99^2
(2).1002^2
3. Calculation:
(1).-1/8a^5b^4c^2÷(4a^2b)
(2).5(x-y)^5÷(x-y)^2
(3).[x(x+1)+x^2(x-1)]÷(-3x)
(4).[(m+n-p)(m+p+n)-(m+n)^2]÷(-p)

(1) (30-3)*(30+3)=30^2-3^2
(2) (6-0.1)*(6+0.1)
(3) (100-1)*(100+1)
(4) (1000+5)*(1000-5)
(1) (100-1)^2=100^2-2*100*1+1^2
(2) (1000+2)^2

The two cars leave from two places 400 km apart, and they are still 10 km apart three hours later. It is known that the speed of one car is 55 km, and what is the speed of the other car?

(400-10) △ 3-55 = 75 km / h

32.5 to 0.15

32.5 to 0.15
32.5:0.15
=3250:15
=650:3

The railway from Ningbo to Hangzhou is 168 km long. It should be drawn on a 1:3000000 scale national railway diagram______ ．

168km = 16800000cm, 16800000 × 13000000 = 5.6 (CM); answer: 5.6CM should be drawn; so the answer is: 5.6CM

If - M / 4x ^ m-1y ^ 2n is the quintic monomial of coefficient-1, find the values of M and n

According to the meaning of the title
{-m/4=-1
{m-1+2n=5
Solution
m=4,n=1

When processing a batch of cement, Party A will finish it in 6 hours, and Party B will finish it in 9 hours. Party A will finish it alone, how many parts of this batch of parts can be finished per hour

A alone, 1 / 6 per hour

In the acute triangle ABC, if ∠ a = 50 ° and the vertical bisectors on both sides of AC and BC intersect at point O, then the degree of ∠ BOC is?

130

There is a square with an area of 1 square meter. Half of it will be cut off in the first time, and the remaining half will be cut off in the second time. After six times, the area of the remaining paper will be
There is a square with an area of 1 square meter, half of which is cut off in the first time, and the remaining half is cut off in the second time. In this way, how many square meters of paper are left after six times?

1 / 2 ^ 6 = 0.015625 (M2)
A: after 6 times, the remaining paper area is 0.015625 square meters

1. Given that the image of a function y = ax + B passes through point (0,2), and the figure enclosed by it and the coordinate axis is an isosceles triangle, then the value of a is?
2. If the function y = - x-4 intersects with point a, there is a point m on the straight line. If the area of △ AOM is 8, then the coordinate of point m is?
3. When a chemical plant produces a certain product, the ex factory price of the product is 500 yuan per ton, and the cost of raw materials (including equipment loss) is 200 yuan per ton. At the same time, the production of 1 ton of the product needs to pay the environmental treatment fee and various expenses, totaling 100 yuan. Write the functional relationship between the profit y (yuan) and the product sales x (ton)? How many tons of the product can be sold to obtain a profit of 100000 yuan
(Note: just write the answer)
emergency

1, isosceles triangle, then a = 1 or - 1;
2,M(0,-4);
3,y=(400-200-1--)x=100x
Let y = 100000 and x = 1000