I want to find some math homework problems for my children to do in grades 4 and 6, please help

It's good to go to the bookstore and buy a relatively good copy.

1.Construction workers use cement, sand, and gravel to make 96 tons of concrete according to 2:3:5, how many tons of cement, sand, and gravel are needed?

2.There are a total of 550 tractors in a county, of which the ratio of the number of large tractors to the number of walk-behind tractors is 3:8.

3.An 84-centimeter-long copper wire is used to form a sharp triangle, and the ratio of the length of the three sides of this triangle is 3:4:5. How many centimeters are each of the three sides of this triangle?

4.The average of the three numbers A, B, and C is 84, and the ratio of the three numbers A, B, and C is 3:4:5.

5.Primary Mathematics Grade 6 Homework Questions: The average number of two numbers B is 25, the ratio of number A to number B is 3:4, what are the two numbers A and B?

6.The degree ratio of two acute angles of a right triangle is 1:5, what are the degrees of each of these two acute angles?

7.The circumference of a rectangular experimental field is 120 meters, and the ratio of length to width is known to be 2:1.

8.The store shipped a batch of refrigerators, sold 18 units, the ratio of the number of units sold to the number of units left is 3:2, how many refrigerators are shipped?

9.There are red, green and yellow balls in the carton, the number of red balls is green balls, the ratio of the number of green balls to the number of yellow balls is 4:5, it is known that there are 81 green balls and yellow balls, how many three-color balls are there?

10.A map, 20 centimeters on the map represents the actual distance of 10 kilometers, find the scale of the old objects on this map?

11.The actual distance from A to B is 120 kilometers, how many centimeters should be drawn on a map with a scale of 1:6000000?

12.On a map with a scale of 1:300, the distance between the east and west villages is measured in centimeters, and the actual distance between the east and west villages is what is the meter?

13.The playground of Chaoyang Primary School is a rectangle, 120 meters long and 75 meters wide, drawn with a scale to form a floor plan, how many centimeters are the length and width of the plan?

14.On a map with a scale of 1:6000000, the distance between two places is measured to be 3 centimeters, how many kilometers is the actual distance between the two places?

Set pencil a and eraser (14-a).

Column A A = 5 pencils, 5 erasers, 9 erasers.

If the question is wrong, it should be changed to: pencil each element, eraser each element If it is modified in this way, the solution should be:

Solution: If you buy x pencils, you can buy erasers (14-x).

The column equation gets: x=5so, 14-x=9

A: Buy 5 pencils and 9 erasers.

Let's say the beans buy erasers.

Spent more yuan. The price difference, so I bought 5 pencils and 9 erasers.

In fact, binary equations are the easiest to solve, but I was worried that I wouldn't have learned the equations, so I used the most primitive method.

Solution: Let's buy x pencils and 14-x erasers.

x=5A: I bought 5 pencils and 9 erasers.

The topic should be the unit price of pencil and the unit price of eraser, right?

If that's what I'm talking about, here's how to do it:

Solution: I bought x pencils and y erasers.

x+y=14

Solution x =5

y = 9 A: Pencils were bought for five and erasers for nine.

I bought x pencils and y erasers.

According to the title, x+y=14

Solve the system of equations to get x=5, y=9

A: I bought 5 pencils and 9 erasers.

Solution: If you buy x pencils, you will have erasers (14-x).

Column: Solution: x=5

I used to do this a lot when I was 6 years old.

5 pencils, 9 erasers.

There is no formula.

Solution: If you buy x pencils, you buy = 4

x=5 so eraser bought 14-5=9

A: I bought 5 pencils and 9 erasers.

The upstairs method can be pulled, and you should have learned the equation in the sixth grade!

5 pencils and 9 erasers.

A is correct B<0 then B is negative, if the product is positive, then A is negative<0b is correct B<0 then B is negative, and if the product is negative, then A is a positive number" 0C is correct ab>0 means that AB is both positive or negative, so A B is also a positive number "0

The premise that the D error A b is meaningless is that the divisor is 0, but ab<0 means that ab is not 0

C is wrong, and the result of multiplying A and B is negative, then one of them must be negative, and if the negative number is divided by one number, the result is negative. A number divided by a negative number, and the result is also negative.

A is definitely the same as AB.

B is definitely on AB variant.

c a b>0 proves that ab has the same sign as ab>0 d a b may be meaningless then b is zero and ab=0

D False: This is a problem of examining the same name and different names, and memorize the problem as a theorem!

d, because when a b is meaningless, b can only be zero, and ab=0, which does not match ab being less than zero.

I'm a little puzzled.,This should be the question of the first year of junior high school.,Which version of the textbook did the landlord use?

Yes a. If ab is greater than zero, there must be a number greater than zero, and a b is less than 0

Because m and n are opposite to each other and are not zero, m+n=0 and mn=-1.

And because x and y are reciprocal to each other, xy = 1, and because the absolute value of z is 2, so z = 2 or z = -2.

So the original formula = 1x0 - (-1) + 2x1xz

1+2z Therefore, there are two solutions: 1. When z=2, the original formula = 1+2x2=52, when z = -2, the original formula = 1+2x(-2)=-3 Note: This is the question of the sixth grade of primary school! We've just finished our first year of junior high school, and now...

The landlord must choose me!!

The reciprocal of x y means that their product is 1

m n is the opposite of each other, indicating that their sum is 0

So xy(m+n) 0

m n must be 1 you don't believe in a few examples of opposite numbers, try 2xyz 2x1x2 or 2x1x( 2) because, |z|=2 It is possible that z is 2 or minus 2

So there are two cases when z is positive.

When z is positive.

It's weird. Negative numbers are a question in the first year of junior high school, and this is not for the sixth grade, right?

mn is the opposite number, so m+n=0

xy is the reciprocal of each other, xy=1

z|=2,∴z=+2or-2

m/n=-1

It's worth it.

xy(m+n)=0, because m and n are inverse numbers, add to 0, m n=-1, 2xyz=2z, 0-(-1)+2z=1+2z, z is plus or minus 2, and the result is -3 or 5

1, 52752cm=

2.(6x6-5x5) meters squared).

4710 (lap).

5.Perimeter: Area: meters squared).

Note: Since the square number cannot be typed, the square of a is replaced by axa. The unit was replaced with the square of the meter. Thank you for your understanding.

1.The front wheel diameter of a children's bicycle is 28cm, and it rotates 120 times per minute, how many meters does the wheel advance in 5 minutes?

28cm==168m.

2.Outside a circular flower bed with a diameter of 10 meters, a cement road with a width of 1 meter was built, how many square meters is the area of this cement road?

10x1=10 square meters.

3.It is known that the circumference of a circle is equal to that of a square, and the variable length of the square is 314cm, what is the radius of the circle in centimeters?

314x4 divided by 2

1256 divided by 2

400 divided by 2200 cm.

4.Acrobatic unicycle tightrope walking, the diameter of the wheel is 50cm, Zhou Guochang's steel wire, how many turns does the wheel have to turn?

50cm = divide [ = divide = 3 turns 5.What is the circumference and area of the school sports field (pictured)? (The radius is 30m, the diameter is 60m, and the width is 100m).

Let's see if question 5 is a problem?

6.How many lanterns are needed for a circular square, with a diameter of 150 meters, around which there are lanterns every other meter?

Divide = 471 divide.

100 pcs.

(I'll take it for you).

1.28* cm).

52,752 centimeters = meters.

2.10 2 = 5 (m) 5 + 1 = 6 (m) sq.m.).

3.314*4 cm).

4.50 * 4710 157 = 30 (circle).

5.The figure is invisible.

6.150*m) 471 pcs).

Please choose me.,This is what I did and knocked.,If you can pass the picture with 5 questions.,You can also ask me.。

1, with a diameter of 28, a circumference of 28, 28 120 per minute, and 600 28 in five minutes

2. The ring problem, of course, should be figured out that the diameter of the small circle is 8cm, the radius is 4cm, and after simplification, it is 9 3, and 314 is equal to the square of x

Let's talk about the first three questions first, and give points.