One table and four legs are needed to make a table. 20 tables can be made from 1m3 wood, or 400 legs can be made from 12m3 wood. How can we plan to use materials to make as many tables as possible?

If x tables are made, the material of the table top is 120xm3, and the wood of the legs is (4 × 1400x) m3. From the meaning of the question, we get 120x + 4 × 1400x = 12, and the solution is x = 200. Then 120x = 120 × 200 = 10 (M3) 12-10 = 2 (M3). A: we can make as many tables as possible by using 10m3 wood as the table top and 2m3 wood as the legs

A table consists of a table top and four legs. If 1 cubic meter of wood can be used to make 20 table tops of a square table, or 400 legs, the existing 12 cubic meters
At present, there are 12 cubic meters of wood. How can we plan to use materials to make as many tables as possible? (equation)

Setting: the table top is x cube and the table leg is (12-x) cube
20x = (400 (12-x)) / 4 20x = (4800-400x) / 4 multiply both sides by 4 to get:
80x = 4800-400x 480x = 4800 x = 10 (cubic, desktop)
12-10 = 2 (cube, making table legs)
Answer: the production table top is 10 cubic meters, the production table leg is 2 cubic meters

The greatest common factor and the least common multiple of 72 and 16

The maximum common factor of 72 and 16 is 8
The least common multiple of 72 and 16 is 144

It is known that the image of the first-order function y = KX + B passing through the point (- 1, - 5) and the positive scale function y = half x intersects at the point (2, a)

A function of degree y = KX + B passing through (- 1, - 5)
So - 5 = - K + B
Y = half X of the image intersection point (2, a)
a=1/2*2=1
That is to say, a function of degree (2,1) has:
1=2k+b
k=2,b=-3
So the linear function is y = 2x-3

Composition 350 words in unit 2 of PEP primary school Chinese volume 5

Childhood is colorful, just like beautiful seashells by the sea; childhood is carefree, just like wave dolls all day long; childhood is pure and sweet, just like clear spring water in mountain streams. Speaking of childhood, it reminds me of an interesting thing
I remember that when I was four or five years old, my grandmother once gave me and juju a high-grade milk candy that makes people drool at first sight, which made us two "greedy cats" very happy. We were really in full bloom
Neither of us was willing to eat. I said, "shall we have it?" "OK, let's eat together!" Juju agreed. My hands and feet were quick. I took it apart two times. I took out sugar and craned my neck to see Juju's candy
"Yours is bigger than mine!"
"Where? I'm short of something here!"
"Well, mine's dissolved!"
"You have a lot of color and milk!"
“……”
We all felt that we were at a loss. But as soon as we said we wanted to change, we quickly turned around, and no one wanted to. We began to eat candy. "1, 2, 3!" we ate it together. WOW! It's so sweet, so fresh, so delicious! After eating for a while, I said, "take it out and have a look, "You're older or I'm older!" Juju said, sticking out the sugar on the tip of her tongue like a pug. When I saw it, I stuck out my tongue like her, but she said I couldn't see it clearly, so I had to put the sugar on the tip of my tongue, half of it on the outside, and tried my best to stick out my tongue. At this time, just as a little dog got under my feet, I couldn't dodge, and the sugar on the tip of my tongue accidentally fell to the ground, It's a coincidence that my whole body rushed forward, and my right foot was right at the candy. Oh, what should I do? It was too late. Before I could recover, my foot had already stepped on "baby". I was so anxious and angry: "you stinky dog, rotten dog, dead dog!" I pointed my foot at the dog's belly, and the dog ran away in fright. I raised my foot and broke off the sugar on the sole with my hand, I can't help rubbing my hands full of sugar and staring at Ju Ju's mouth with my eyes. I can't help but look at the milk candy. I keep swallowing. I wish she would spit out the sugar and bite half of it for me. I can't watch it any more. I just feel my nose is sour, Tears flow down like broken beads: "Mom, I want to eat Sugar I want to eat Sugar... "
Now, old time has come, and he has taken away his childhood in a hurry. I will not haggle over a grain of sugar as before, and I will not cry. Thank old time for compiling his childhood into the purest, truest and most beautiful book and printing it in our hearts

The farm raises 1250 chickens, 14% more ducks than chickens. How many ducks does the farm raise?

1250x (1 + 14%) = 1425
1425 ducks

The problem of potential difference moves a positive charge of 1.x10 to the negative 8th power C from point a to point B. the work done by the electric field force is 2.4x10 to the negative 6th power J,

① EP = q? Name? AB =? 2.4x10 to the second power V / M

Probability (10 17:56:49)
There are two people playing the game, the rule is: the first person says "1" or "1, 2", the second person says "3" or "3, 4", then it's the first person's turn, and then go on, so the two people take turns again and again, each person can only say one or two numbers, not three numbers, who grabs 10 first, who wins
Do you think the game is fair? If not, which announcer does it favor?

If the person who talks about 10 loses, he will prefer the latter. The latter only needs to say three numbers in each round, and the person who talks about 10 must be the first one. Because 10-1 = 9 is a multiple of 3
Hope to help you!

On the problem of preserving the sign of sequence limit,
Let the sequence {an} converge to a
1, if there is a positive integer n, such that when n > N, an > 0 (or N, an > 0 (or N, an > 0 (or N, an > 0)

Obviously not. The most basic knowledge of calculus, the definition of limit and its strictness,
For example, an = O is a constant column. There is something wrong with your definition immediately. Ha ha, the skepticism is very commendable

How much is odd plus even?

Odd. If it's even plus even, it's even

One table and four legs are needed to make a table. 20 tables can be made from 1m3 wood, or 400 legs can be made from 12m3 wood. How can we plan to use materials to make as many tables as possible?