First, find the most items in the same part.

For example, there are four options: A. (6 6,3) B. (6,3) C. (6,9) D. (6,3)

Then choose D, for various reasons-6 and 3 appear the most.

Second, add, subtract, multiply and divide with known data, and don't choose if you can't get it.

For example, if the lengths of two right angles of a right triangle are 3 and 4 respectively, the height of the hypotenuse is:

A.2.2 B. 2.4 C 2.6 D 2.8

Addition, subtraction, multiplication and division of 3 and 4 can't get A, B, C and D, but 3*4 is 12, which is 5 times different from 2.4. Only this item has a slight relationship, so choose B.

Third, guess with the most basic mathematical knowledge:

Choose three of the nine numbers from 1 to 9 to form a three-digit number, and the probability of being divisible by 3 is ().

a . 1/2 B 1/3 C 1/4D 1/5

We know that every two numbers in natural numbers can be divisible by 3, that is, one number in every three adjacent numbers can be divisible by 3. In other words, the number divisible by 3 accounts for about one-third of the total, so we choose B.

Fourth, exclude some options according to your own knowledge, and then according to intuitive feeling, reducing options is to expand the correct rate.