Playing card game: Xiao Ming's back to Xiao Liang, let Xiao Liang operate according to the following four steps: the first step & nbsp; distribute the left, middle and right three piles of cards, each pile has the same number of cards, and no less than two cards; the second step & nbsp; take out two cards from the left pile and put them in the middle pile; the third step & nbsp; take out one card from the right pile and put it in the middle pile; the fourth step & nbsp; There are several cards in the left pile, so take a few cards from the middle pile and put them into the left pile. At this time, Xiao Ming accurately said the current number of cards in the middle pile. What do you think is the current number of cards in the middle pile? Explain your reasons

Playing card game: Xiao Ming's back to Xiao Liang, let Xiao Liang operate according to the following four steps: the first step & nbsp; distribute the left, middle and right three piles of cards, each pile has the same number of cards, and no less than two cards; the second step & nbsp; take out two cards from the left pile and put them in the middle pile; the third step & nbsp; take out one card from the right pile and put it in the middle pile; the fourth step & nbsp; There are several cards in the left pile, so take a few cards from the middle pile and put them into the left pile. At this time, Xiao Ming accurately said the current number of cards in the middle pile. What do you think is the current number of cards in the middle pile? Explain your reasons

In the first step, the number of cards in each stack is x (x ≥ 2); in the second step, the left side is X-2, the middle side is x + 2, and the right side is x; in the third step, the left side is X-2, the middle side is x + 3, and the right side is X-1; in the fourth step, when there are (X-2) cards on the left side, take (X-2) cards from the middle, and the number of cards left in the middle is (x + 2 + 1) - (X-2) = x + 3-x + 2 = 5

Playing cards a person with his back to a friend according to four steps: 1 left middle right three piles of cards, three piles of cards the same number; 1 take two cards from the left into the middle
3. Take one card from the right and put it in the middle 4. If there are several cards in the left pile, put them in the left pile from the middle. Q: is there any rule about the number of cards in the middle pile

Give you a demonstration, you will understand, the same number of three stacks of cards, assuming X cards
0. Initial: X
1. Take 2 from left to middle: X-2 x + 2 x
2. Take 1 from the right to the middle: X-2 x + 3 X-1
3. From left to left: 2X-4 x + 3 - (X-2) X-1
Now there are x + 3 - (X-2) cards in the middle, which is equal to 5

A, B two students with a deck of playing cards in the card face numbers are: 3, 4, 5, 6 of the four cards do draw math game. The rule of the game is: all the four cards face down, wash well, from which randomly take one, draw the number as the number of ten, and then put the card back, face down, wash well, and then randomly take one, draw the number as the number If the number is less than 45, then a wins, otherwise B wins. Do you think the game is fair? Please use the probability knowledge to explain the reason

Xiao Ming and Xiao Liang play a card game. Xiao Ming turns his back to Xiao Liang and asks him to follow the following four steps: Xiao Ming and Xiao Liang play a card together
The rules are as follows:
Xiao Ming's back to Xiao Liang, let Xiao Liang follow the following four steps:
The first step is to distribute the left, middle and right stacks of cards, each stack of cards is no less than two, and the number of cards in each stack is the same;
Second, take out two pieces from the left pile and put them in the middle pile;
The third step is to take out one from the right pile and put it into the middle pile;
Step 4: if there are several cards in the left pile, take a few cards from the middle pile and put them into the left pile
At this time, Xiao Ming accurately said the number of cards in the middle. What do you think is the number of cards in the middle_________ How did Xiao Ming get the result?

If the left and right sides are given 2 + 1 = 3 in the middle, if the left side is given two, then the left side will lose two, if the middle side is given two less, then there will be 3 + 2 = 5 left in the middle