In a math problem, it s more difficult, don t come if you can t, proportional, give 15 points direct

Determine whether the two quantities in the following questions are proportional to the city, and explain the reasons:

The unit price of newspapers and periodicals is fixed, the number of copies ordered and the total price.

Because. Total price: the number of copies ordered The unit price of the newspaper (certainly).

So. proportional.

The ratio is certain, and the ratio is the former and the posterior.

Because. Ratio of the previous term: The latter term of the ratio (certainly).

So. proportional.

The oil yield is constant, the weight of the oil and the weight of the peanut.

Because. The weight of the oil: The weight of the peanut The oil yield (certainly) so. proportional.

The distance is certain, the distance traveled and the distance not taken.

Because. Distance Traveled Distance Not Traveled Total distance (certainly) is not a ratio certain.

So. Disproportionate.

The height of the cylinder is certain, the perimeter of the ground and the area of the sides.

Because. The side area of the cylinder: the circumference of the bottom surface is high (certainly).

So. proportional.

The width of the rectangle is fixed, and the circumference is the same as the length.

Because. Circumference 2 length and width (definitely).

It is not a ratio certainly.

So. Disproportionate.

Fairly simple. The unit price of newspapers and periodicals is fixed, the number of copies ordered and the total price.

w = unit price * number of copies Yes.

The ratio is certain, and the ratio is the former and the posterior.

a:b=fixed value a=fixed value b so it's not.

The oil yield is constant, the weight of the oil and the weight of the peanut.

m peanut * oil yield = m oil Yes.

The distance is certain, the distance traveled and the distance not taken.

s total -s has gone = s has not gone so it is not.

The height of the cylinder is certain, the perimeter of the ground and the area of the sides.

Side area: Bottom perimeter height Yes.

The width of the rectangle is fixed, and the circumference is the same as the length.

Circumference = 2 length + 2 width So it's not.

So be it.

Let's give you the formula Total price: number of copies = unit price.

Former term: Later term = ratio.

Weight of oil: peanut weight = oil yield.

Distance traveled + distance not traveled = distance.

Side area Base circumference = height.

Circumference - 2 times the length) 2 = width.

The right side of the above equation is certain and proportional to two related quantities, one quantity changes, and the other quantity also changes, if the ratio of the two numbers corresponding to these two quantities is constant, these two quantities are called proportional quantities, and their relationship is called proportional relations.

Let's do some research for yourself

The unit price of newspapers and periodicals is fixed, the number of copies ordered and the total price.

Because. Total price: the number of copies ordered The unit price of the newspaper (certainly).

So. proportional.

The ratio is certain, and the ratio is the former and the posterior.

Because. Ratio of the previous term: The latter term of the ratio (certainly).

So. proportional.

The oil yield is constant, the weight of the oil and the weight of the peanut.

Because. The weight of the oil: The weight of the peanut The oil yield (certainly) so. proportional.

The distance is certain, the distance traveled and the distance not taken.

Because. Distance Traveled Distance Not Traveled Total distance (certainly) is not a ratio certain.

So. Disproportionate.

The height of the cylinder is certain, the perimeter of the ground and the area of the sides.

Because. The side area of the cylinder: the circumference of the bottom surface is high (certainly).

So. proportional.

The width of the rectangle is fixed, and the circumference is the same as the length.

Because. Circumference 2 length and width (definitely).

It is not a ratio certainly.

So. It's not proportional, right.

All events occur = the product of the probability of the event.

Columnar calculation: 5% 10% 10% =

A: The probability that she saw a squirrel in the mountains, two centipedes and two snails is.

It's simple, squirrels 5%, centipedes 10%, snails 10%, three happen at the same time, just multiply the three.

Don't think it's that complicated.

It's so hard, I can't understand it, I'm in the sixth grade.

However, I have personal experience that you have to do this kind of topic yourself.

Otherwise, you still don't understand, or you should ask your teachers, parents, or classmates.

Now in the sixth grade of primary school, math problems are quite difficult. It's more difficult than before, and you can check it on the Internet if you don't know it.

I asked the teacher to ask my parents, otherwise I would go to homework help.

The length of the first side: total length = 4:15

The second side length: total length = 5:15

The third side length: total length = 6:15

Now that we know that the total length is 150cm, we can solve it according to this idea.

The length of the first side: 150 = 4:15

The length of the first side = 150 4 15 = 40 (cm) The length of the second side: 150 = 5:15

The length of the second side = 150 5 15 = 50 (cm) The length of the third side: 150 = 6:15

The third side length = 150 6 15 = 60 (cm).

1.Liang Liang read a book, read one-tenth of the book in the morning, and read 6 more pages in the afternoon than in the morning, which is the ratio of the number of pages read to the number of unread pages is 1:3. How many pages are in the book?

The book has x pages.

Morning read x 10

Read 6 more pages in the afternoon than in the morning, which is x 10+6

x/10+x/10+6)/[x-(x/10+x/10+6)}=1:3

x = 120 pages.

2.A ratio, the sum of the two internal terms is known to be 28, the difference is 12, and the ratio of the two ratios is 4, write this ratio?

Let the two inner terms be x and y

x+y=28

x-y=12

x=20,y=8

This ratio is 80:20 = 8:2 or 32:8 = 20:5

3.In the ratio 3:12=6:24, if the latter term of the first ratio is increased by 6, how does the latter term of the second ratio change in order for the ratio to remain true?

The second is 12 more than the latter term

One cone is 3 centimeters high, a cylinder of the same volume as it is 3 centimeters high, and the base radius is 3 centimeters. Q: What is the radius of the bottom surface of the cone?

You just have to buy a copy of Chinese and math at a bookstore to know the answer.