What is the skill formula of queuing problem in senior one?

1. Find the whole of the known part (addition): What is two? When two numbers are added, one is added. When two numbers are added, one number is subtracted. When two numbers are added, they don't count as one.

2. Find the part of the known whole (by subtraction): two numbers, subtract one, add one, add one, add one and add one.

If there are four people in front and three people in the back, how many people are there?

The first question is "3 people in front, 4 people in the back", and the formula is "front+back+1 = total number of people".

The second question is "ranked fourth in the front and third in the back", and the formula is "front+back-1 = total number of people".

The third question is "From the back row to the fourth row, there are three people behind", and the formula is "front+back = total number of people".

Thoughts on solving the problem of queuing in grade one;

1, fixed direction:

Front, left and head, listed on the left.

Back, right side and tail, listed on the right side.

2. Fixed position (take δ and χ as examples):

People with names, especially those marked with △; Other characters are marked with ○; When the number of people is large, the mark is omitted.

3. Bidding conditions (how much, how much, how much) and bidding problems (a * * *, in the middle).

4. Look at the chart (and calculate the result).