Who s coming, puzzle! Puzzle???!!!

Choose (is) hiding : Because what you want to find out is where the thief is hiding now"Ready-to-go"Indicates the action that is being carried out now or at this stage"

In a flash"Indicates a regular action, so 1hides cannot be selected; was hidingPast continuous tense, illogical, cannot be chosen.

Hide; Hide (hide yourself)."hide is an intransitive verb, which can also be used as a transitive verb, but can only be used as an object with a reflexive pronoun, i.e. hide oneselfThere is no passive voice in either case. Therefore, it is not possible to select is hidden

Another example: if you hide or if you hide yourself, you go somewhere where you cannot easily be seen or found

Where lead is an object clause that must be followed by a complete sentence.

d is preceded by has and the following tense should be consistent, and the thief's action of hiding should be in progress, so d is chosen

Choose C, which should be the present participle as a postposition, indicating the state of this thief.

Now in the continuous tense, active. Omit IS option C

In math class, Mr. Wang came up with such a problem: chickens and rabbits are in the same cage, with a total of 30 heads and 80 legs. Excuse me: How many chickens and rabbits are there?

There are not many conditions for this question, and it contains 2 unknown quantities, so the students did not immediately think of the solution for a while. But for a while, our class. Mathematics princess Gao Yuwei raised her hand first, and she said:

This problem can be solved using the hypothetical method. Seeing the confused eyes of her classmates, she confidently continued: "Assuming that they are all chickens, then there should be 30 heads and 60 legs."

However, the title states that there are 80 legs, and 80-60 = 20 legs are missing, because a chicken is 4-2 = 2 less than a rabbit, 20 2 = 10 (only), 30-10 = 20 (only), so there are 10 rabbits and 20 chickens. ”

After hearing this, the students suddenly realized one by one. I raised my hand and said, "Teacher, this question can also be assumed to be all rabbits."

A rabbit has 4 legs, it should have 4 30 = 120 legs, now there are 120-80 = 40 legs, 4-2 = 2 (legs), 40 2 = 20 (only), 30-20 = 10 (only). So there are 20 chickens and 10 rabbits. ”

After hearing this, the students all nodded in agreement.

Teacher, I have another solution: column equations". As soon as I sat down, I impatiently raised my hand. "Solution: Suppose there are x rabbits and (30-x) chickens. The column equation 4x (30-x) 2=80 is solved x=10.

Very good! So is there another solution? "Students, now please take out the 1000th issue of "Elementary School Mathematics Newspaper" in 08, do the above exercises, and compare the above solution methods." ...

Oh, there are multiple solutions to a problem, it's really interesting!

Top 500).

Pi 501-1000 bits.

Pi 1001-1500 bits.

Pi 1501-2000 bits.

Pi 2001-2500 bits.

Extend Cd to F so that Cf = AE

be=bf, b=60 degrees.

The bef is also a regular triangle.

BC=DF, BE=EF, B= F=60 degrees BCF EDF

ce=de

The first question, from left to right.

The solution of 50 * 40 * (22-15) = 2000 * 7 = 14000 cubic centimeters is wrong, because the radius of the ball is calculated at this time r=, and the diameter d=2r=30cm>22cm, which means that the ball is not completely submerged!!

Correct solution: Use the ball deficiency formula: v=, to get r=1654cm, so the volume of the ball is cubic centimeters.

It's strange that the wrong answer is also adopted!