Ask 4 math questions, hurry!! How to solve these four math problems, thank you!!

1.Solution: Because B is twice as effective as A, it takes 4 days for B to complete alone.

In other words, A completes 1 8 in one day, and B completes 1 4 in one day;

Let's say they have done it all together in x days (i.e., 1).

Then there is the equation: x(1 4+1 8)=1;

Solution: x=8 3=2 and 2 3, one day is equal to 24 hours, so 2 3 days = (2 3) * 24 = 16 hours;

The result: 2 days and 16 hours to complete.

2。What is being tested here is the understanding of the column.

Analysis: 3:100 means. Every 3 parts (or kilograms) of pesticides should be mixed with 100 parts (or kilograms) of water. Q: How much water do you need if there is a pesticide?!。 We just need to figure out how to turn 3 portions into portions.

To put it simply, you might as well count it like this, 3 parts to 100 parts;

6 copies for 200 copies; (both multiplied by 2).

The portion is to be 250 parts (all multiplied;

So the result is: 250 servings;

In terms of proportions, my solution is:

Set: need water x kg;

List the equation: 3 100=

Remove the denominator: 3x=750;

Solution: x=250 kg;

Find out how much soil has been dug up. Apparently what was dug up was a cuboid.

The volume of the box is required first. In this way, you can find out how many cubic meters of soil have been excavated;

The volume of the box is calculated as: length*width*height.

So, the volume of the excavated earth is: cubic meters).

The proportional relationship here is: Volume Weight = 4 7;

It is advisable to set up a total of x tons of excavated out;

Then according to the volume weight has: 4 7=324 x;

The denominator is: 4x=7*324;

Solution: x=567 (tons);

And because it can transport tons at a time. So a total of 567 shipments.

1.Solution: Let B be completed alone in x days.

Get: 1 (1 8*2)=4

Because B takes 4 days to complete.

So get 1 (1 8 + 1 4) = 8 3 (days) yes or not I don't know, you can do the math.

Question 1: 1 8+1 4=3 8 1 3 8=8 3

Question 2: Question 3:

1.A job takes 8 days to complete alone, B is 2 times more effective than A, and two people work together at the same time, how many days can it be completed?

ans: A completes 1/8 in one day B completes 1/4 in one day Two people complete 3/8 in one day 3/8 multiplied by 3 will be greater than 1 It takes 3 days to complete.

2.Who configures a pesticide, in which the mass ratio of pure pesticide to water is 3:100, and the existing pure pesticide kilograms, how many kilograms of potion can be configured? Solve with proportions.

ans:3:100=:Water Water = 250 kg plus 250 kg Potion kg can be configured.

3.If a construction team digs a foundation that is 24 meters long, 24 meters wide and 2 meters deep, and the excavated soil weighs an average of 7 tons per 4 cubic meters, how many times will it be transported if two-thirds of the soil is transported away by a truck with a load tonnage?

ANS: The total amount of soil is: cubic meters 2/3 of the amount of soil is 1296 cubic meters 1296 cubic meters divided by 4 cubic meters is 324 multiplied by 7 tons is 2268 tons and finally divided by one deadweight ton is equal to 504 times 504 times.

2: Sell early.

<>4: Two noisy wide, medium finch m= or m=

1. Solution: 1-20, yes.

3、x=0 y=0

4. Solution: The first half of the original formula = 2011 2011 quadratic - 2 2011 quadratic - 2009

2011-2) 2011 Quadratic -20092009 2011 Quadratic - 2009

2009 (2011 quadratic -1).

The second half of the original formula = the cubic of 2011 + the quadratic of 2011 - 2011-1 (the cubic of 2011 - 2011) + (the quadratic of 2011 - 1) 2011 (the square of 2011 - 1) + (2011-1) (2011 + 1) i.e. the original formula = 2009 2010 2012 fractional line.

About the 2009 cut-off.

P.S. It may be a little difficult to understand when writing in Chinese characters, but it is good to write it in numbers.

2: 1 1 0 -1 -1 0 6 cycles once and finally 1 1 0 -1 -1 -1 totals 0

It can be known that the time used for study or work is 1-3 8-1 8-1 6=1 32The time used for study or work is 1-3 8-1 8-1 6=1 3 red wool 3 10 white wool 1 2

So the sum of red wool and white wool is 3 10 + 1 2 = 4 5, so the blue wool is 4 5-3 5 = 1 5

The number of first and second prizes accounts for 1/2 of the total number of people

So the third prize is 1 2

Obtain. The number of second and third prizes accounts for 8/9 of the total number of people

So the first prize is 1 9

So the second prize is 1-1 2-1 9=7 18

Let the original drink be V liters.

1/2v+3/4=11/12

Solve the above equation to get v=3

1. (1) 13/24.

2) One-third.

II. 8/25.

3. Second class: 7/18 3rd class: 1/2.

Four, five-thirds liters.

Question 1: 13 out of 242. 1/3 of a small question

dot on the AB line) or 9 (point E on the CD line).

18 30 Right triangle.

Because EC=1 2AB, FC=1 2BE, ABE= ECF=90°, ABE is similar to ECF

So eab= fec

So aef=90°

i.e. AEF is a right triangle.

9.No picture. 10.The equation can be reduced to the following: (a-5) squared + (b-12) squared + (c-13) squared = 0

So a=5, b=12, c=13

So abc is a right triangle.

11.No picture.