Make a 5cm deep uncovered rectangular iron box with a 50cm long and 20cm wide rectangular iron sheet (the thickness of iron sheet at welding joint is not included) Q: what is the maximum volume of this rectangular iron box? Wrong. It's a rectangular iron sheet 50 cm long and 40 cm wide, making a 10 cm deep uncovered rectangular iron box

Make a 5cm deep uncovered rectangular iron box with a 50cm long and 20cm wide rectangular iron sheet (the thickness of iron sheet at welding joint is not included) Q: what is the maximum volume of this rectangular iron box? Wrong. It's a rectangular iron sheet 50 cm long and 40 cm wide, making a 10 cm deep uncovered rectangular iron box

50 cm long, 40 cm wide rectangular iron sheet, do a 10 cm deep uncovered rectangular iron box
The cuboid iron box has a maximum volume of 10 x 10 x 40 = 4000 (cubic centimeter)

Use a rectangular sheet of iron 10 decimeters long and 6 decimeters wide to make a rectangular uncovered iron box 1 decimeter high (the thickness of welding joint and sheet is ignored). What is the maximum volume of this iron box?
No equations!

Volume = (10-1-1) × (6-1-1) × 1 = 32 cubic decimeters

The plural or the singular after each, such as they each have or has

They each have a bag for sports sports.Each Of them has a bag for sports

The bookstore brought in a batch of fairy tale books, and sold 10% of them on the first day, 150% of them on the second day, and 25 more than the first day
How many fairy tale books are there in all?
Be clear!

The second day = 10% * 150% = 15%
The whole book = 25 (15% - 10%) = 500
There are 500 copies in one

As shown in the figure, the acute triangle ABC, BC = 10, height ad = 6, efgh is its inscribed rectangle, let EF be x, eh be y, (1) find the functional relationship between Y and X, and write the automorphism

We put FG next to BC
Because EH is parallel to BC
So eh / BC = AK / AD (k is the intersection of AD and EH)
y/10=(6-x)/6
y=5(6-x)/3=-5/3x+10
0

English translation
1 the women in blue
2 the map on the wall
3 the girl with long hair
4 the boy in the middle
5 the book on the right
6 the man on the left
7 twin brothers
8 look like each other
9 learn from...
10 in the future

A woman in blue
2 map on the wall
The girl with long hair
The boy is in the middle
The book is on the right
The man is on the left
Seven twin brothers
They all look alike
Learn from
10 in the future

As shown in the figure, in the cube abcd-a1b1c1d1, M is the midpoint of CC1, AC intersects BD at point O, proving: a1o ⊥ plane MBD

It is proved that: connecting mo. ∩ DB ⊥ A1A, DB ⊥ AC, A1A ∩ AC = a, ∩ DB ⊥ plane a1acc1. And a1o ⊂ plane a1acc1, ∩ a1o ⊥ dB. In rectangular a1acc1, Tan ∩ aa1o = 22, Tan ∩ MOC = 22, ∩ aa1o = ∩ MOC, then ∩ a1oa + ∩ MOC = 90 °. A1o ⊥ OM. ∩ om ∩ DB = O, ∩ a1o ⊥ plane MBD

how to make friend
Need an English proverb about how to make friends!

Friendship is extremely important to me.It ' s like being brothers or sisters ,but even more than that.I mean,I would do nearly anything for my friend,and I would expect that he would do the same for me.If he didn't help me when I was in need,then I would not consider him a good friend.I have a lot of different kinds of friends.Some are loud, others are shy.I prefer having a real variety of friends.
Firstly ,making friends with all kinds of people is everyones dream ,but is difficult and impracticle,you should make friends as your character.
secondly,you should express yourself well when you are excited.i am this one ,sometimes i am silent and do not want to play and talk with other people especially the stranger,but if i have the fervor ,i will talk with them and open my mouth as much as i can.
thirdly ,you must learn more ,if the topic the other people are talking is unfamiliar to you ,you will feel difficult to join in their atmosphere.
A friends in need is a friend indeed

Given that the coordinates of the three vertices of △ ABC are a (1,3), B (- 1, - 1) and C (- 3,5), the equation of the circumscribed circle of the triangle is obtained

Let the equation of circle be (x-a) 2 + (y-b) 2 = R2, then (1 − a) 2 + (3 − b) 2 = R2 (− 1 − a) 2 + (− 1 − b) 2 = R2 (− 3 − a) 2 + (5 − b) 2 = R2, a + 2B − 2 = 02A − B + 6 = 0, a = - 2, B = 2, R2 = 10 can be obtained from the solution, so the equation of circumscribed circle of triangle is (x + 2) 2 + (Y-2) 2 = 10

The difference between take charge of and take the charge of

There is no difference
Just take the charge of
In the charge of
Take charge of