Who can make me do these three math problems!? 50

There are no shortcuts in life, and today's opportunism means that you will achieve nothing tomorrow.

1. Set the digit x and the ten digit y

x+y=810y+x+18=10x+y

Get: x=5, y=3

Original two-digit number: 35

2 (1) 400 (360-240) = 5 (minutes) The encounter is 5 laps each run by A and B, for a total of 10 laps.

2) 60 400 (360+240) = 40 seconds.

Set the total number of votes x, and the retail ticket should be y.

Group ticket 2 3x

Retail ticket 1 3x

12×3/5×2/3x

16×1/2×1/3x=16×2/5×2/3xy×1/2×1/3xy=

Surface area of the cuboid = (length and width + width and height + length and height) 2 So the second question:

The surface area of the box = (9 6 + 6 5 + 9 5) 2 Question 4: Find the surface area = (9 7 + 7 5 + 9 5) 2 is to increase the surface area, then you need to subtract 2 base areas.

So the increased surface area is 160 square centimeters.

A pre-only bread.

2000 bags 2

Yes, if you process 2/3 of this batch of milk in 5 days, you can process 200 liters in one day, 600 liters in three days, and only 500 liters of Sakura will be left after 5 days

The cake is divided by the dollar equal to the yuan.

The meat floss bread yuan is divided by equal to the yuan, and the sandwich bread Li Cheng Cong yuan is divided by the equal yuan.

Surface area of the cuboid = (length and width + width and height + length and height) 2 So the second question:

The surface area of the cuboid = (9 6 + 6 5 + 9 5) 2 Question 4: Find the surface area = (9 7 + 7 5 + 9 5) 2 is to find the surface of the surface of the increase in the side disturbance, then you need to subtract 2 base areas.

So the increased surface area is 160 square centimeters.

In the first question, the denominator can be written as [3(n+2 3)], the numerator [2(n+2 3)-7 3], and the formula is [2 3-7 9(n+2 3)], from n to infinity, it can be seen that the subtracted part tends to zero, so the original question is set to be equal to 2 3-0=2 3

The second problem is a number that is numerically close to 3, so when divided by n with the limit of infinity, the result tends to be close to 0

The young man studies hard, this is almost the same as the example questions in the textbook.

(1) After leaving T hours, the cruise ship leaves Chongqing 36t kilometers. If t=10, then 36t=36 10=360 (km) (2) after driving t hours, the cruise ship is 648-36t away from Yichang If t=12, then 648-36t=648-36 12=216(km).

Question 7, Question 1, the sufficient and necessary condition for a system of n-element homogeneous linear equations to have a non-zero solution is that the determinant of its coefficient matrix is equal to 0, and the analysis is as follows, I hope it can help you... Question 8.

1, A third of a rope is 40 centimeters longer than a quarter of it, how many centimeters is this rope long?

40 (1 3-1 4) = 480 cm.

A: This rope is 480 cm long.

2 3:4 means that the ratio of two quantities is 3 to 4Or it means 3 divided by 4, three-quarters.

1. This rope is long:

480 cm.

4 represents the proportion, and the ratio is: 3/4

I'm glad to answer your questions and wish you progress in your studies! The [the1900] team will answer the questions for you.

1. Let the length of this rope be xcm.

Since one-third of the rope is 40 centimeters longer than one-quarter of it, the relationship is obtained: one-third of the length of the rope - one-quarter length of the rope = 40 cm, bringing in the result: one-third x - one-quarter x = 40

The solution is x=480

The length is 40 (1 3-1 4) = 480 cm.

3:4 is a ratio that means 3 to 4

40 (1 3-1 4) 3/4 of 480cm. Divide one into 7 equal parts, the former accounts for 3 parts, the latter accounts for 4 parts, and can also represent 3 4

Solution: Suppose: This rope is x centimeters long.

One-third x = one-quarter x + 40

One-third x = one-quarter x + 40

1/22 x = 40

x=4803:4 means 3, and the first 4 means four-thirds, in fact, this kind of problem is best calculated with equations.

Equations are mostly forward thinking.

That's 12 centimeters of a rope that's 480 in total

(1 3-1 4) = 480 cm.

2 3:4 means that the ratio of two quantities is 3 to 4Or it means 3 divided by 4, or the quantitative relationship between two quantities or three-quarters.

1. Let the rope length be x, so 1 3x-1 4x=40, and find x=480cm