Xiaohua weighs 35 kg, which is 5 / 7 of Xiaogang's weight. How many kg does Xiaogang weigh A ballpoint pen costs 3 / 2 yuan, which is exactly 1 / 8 of a pen. How much is a pen

1、
Weight of Xiaogang
=35 △ 5 / 7
=35 × 7 / 5
=49kg
2、
Unit price of pen
=3 / 2 / 8
=3 / 2 × 8
=12 yuan

Two children are heavier than each other. Xiao Ming says I'm 34.3kg. Xiao Gang says I'm about 34.3kg. Guess who's heavier, please explain why

Xiao Gang is heavy. He says it's about the same as Xiao Ming. He must say it's light

The composition of language, action, psychological activity and environment description

There is a kind of estrangement between people, but some people care for each other, make them closer, more harmonious, and remember what happened that day
That day, there was a math exam. Five minutes before the exam, I checked my pencil case again to see if the stationery was ready. Neutral pen, lie in the pencil case; pencil, lie in the pencil case; rubber, sit quietly in the pencil case; ruler, where is the ruler? I checked again, and murmured to myself, "neutral pen, pencil, rubber..." I looked at my watch. No, class is coming soon. What should I do? I looked anxiously at my classmates next to me and thought, "if only someone could help me" -- but no, all the students around me are seriously preparing things. Only I am looking around anxiously. I think there is a naughty rabbit in my mind, I thought to myself, "it was still there last night, but now it's gone. Did it grow wings? What should I do in the exam? This time 80% of the questions have to use a ruler. What should I do? Borrow it from my classmates? But each of them has only one. The more I think about it, the more anxious I am."
Just then, when Yang Shiqi saw me, he ran over and asked with concern, "Wei Yiran, what's the matter with you?" I said anxiously, "my ruler is missing. What can I do? If I go to buy it now, it's too late. What's more, I don't have any money, let alone go home to take it. What can I do..." After listening to this, she said, "that's what it is. It's easy to do. Leave it to me." then she went back to her seat and broke a brand-new ruler into two parts. I was stunned and looked at her foolishly. She looked at me foolishly. She laughed and said, "what are you doing there? Take it!" then she put a truncated ruler in her hand to me, When she saw that I was still looking at her foolishly, she spread out my hand and put the ruler in my hand. I finally woke up. After a long time, she said: "what are you doing?" she said with a smile: "breaking the ruler to save people" Just then, the bell rang for class
Afterwards, I kept this broken ruler forever

If one of the middle pages of a book is torn off, and the sum of the remaining pages is exactly 1000, how many pages are there in the book, and what page is torn off?

Let the page number of this book be a natural number from 1 to N. the correct sum should be 1 + 2 + +When n = 45, 12n (n + 1) = 12 × 45 × 46 = 10351035-1000 = 35. According to the page number arrangement of the book, the number of the torn page should be odd and even, and the sum of them is odd, 35 = 17 + 18. Therefore, this book has 45 pages, and the torn page is 17 and 18. Answer: this book has 45 pages; the torn page is 17 and 18 Page

Solve equation 7 (x + 3.7) = 39.2
Solve equation 7 (x + 3.7) = 39.2

Simple calculation of 74 * 47 + 94 * 13
It should be simple

74*47+94*13
=74*47+47*26
=47*（74+26）
=47*100
=4700

In △ ABC, ab = AC = 3, BC = 2, then s △ ABC =?
In the parallelogram ABCD, AC = 10, BD = 8, then the value range of AB is?
What are the conditions for making two right triangles congruent?

For isosceles triangle, it is easy to get that the height of BC is equal to 2 √ 2, so s △ ABC = 1 / 2x2 √ 2xbc = 2 √ 2
Let the intersection of diagonal lines AC and BD be o, then they are divided equally according to the diagonal lines of parallelogram, so Ao = 5 and Bo = 4. In △ AOB, the sum of two sides of triangle is greater than the third side, and the difference between two sides is less than the third side, so (ao-bo)

The price of a garment is reduced by 35% at first, and then by 20% after the price reduction. The current price is ()% after the price before the price reduction

（1-35%)×（1-20%）=52％

If the power of 5 π Xa and the power of Y are the same as those of X and Y in the square Yb + 1 of 1 / 7X, then the values of a and B are

It is known that a = 2, B + 1 = 4, so a = 2, B = 3

The cost of a railway locomotive running for one hour consists of two parts: the fixed part is m yuan, the variable part is proportional to the square of the running speed V km / h, and the proportional coefficient is K. if the locomotive runs from station a to station B at a constant speed, what speed should the locomotive run at to minimize the cost?
Do with inequality

y=k*(v^2)*t+m
=k*v*(v*t)+m
=k*v*s+m
The independent variable is V, monotone increasing function. When V is minimum, y is minimum

Xiaohua weighs 35 kg, which is 5 / 7 of Xiaogang's weight. How many kg does Xiaogang weigh A ballpoint pen costs 3 / 2 yuan, which is exactly 1 / 8 of a pen. How much is a pen