1, the maximum number that can be filled in: a three-digit number, the hundredth of which is greater than the decimal number 1, and the unit number is less than the decimal number by 2. What is the maximum number of this three-digit number?
Analysis: We can first set the digit of 10 to x, then set the digit of 100 to x+ 1 and set the unit number to x-2. According to the conditions of the topic, we can list inequalities: x-2.
2. Minimum padding: two digits, with ten digits greater than one digit 1. What is the minimum value of this two-digit number?
Analysis: We can set one digit as x first, and then ten digits as x+ 1. According to the subject conditions, we can list the equations: x (x+1) >; = 10。 Since x is an integer, the minimum value of x is 2, so the minimum value of this two-digit number is 32.
3. Fill in the appropriate number: a four-digit number, whose hundred digits are 2 less than the hundred digits, and 1000 digits are greater than the hundred digits 1. What is this four-digit number?
Analysis: We can set the decimal number to X first, then the hundredth number to x-2, and the thousandth number to x-2+ 1=x- 1. So this four-digit number can be expressed as:1000 (x-1)+100 (x-2)+10x+digits. Since X is an integer, the minimum value of X is 1, so this four-digit number can be:1000+100-20+10+digits = 1080+ digits. So the minimum value of this four-digit number is 1080.
Ability that can be cultivated by doing math problems;
1. Cultivate logical thinking ability: Mathematical problems often require strict logical reasoning and judgment. By solving problems, we can exercise our logical thinking ability and improve our ability to analyze and reason problems.
2. Cultivate computing ability: Mathematical problems often require accurate calculations. By solving problems, we can exercise our calculation ability and improve our sensitivity and processing speed to numbers and formulas.
3. Cultivate spatial thinking ability: Mathematical problems often involve knowledge such as spatial geometry and analytic geometry. By solving problems, we can exercise our spatial thinking ability and enhance our ability to understand and grasp spatial relations.
4. Cultivate the ability to solve problems: Mathematical problems often need to find solutions to problems. By solving problems, we can cultivate the ability to solve problems and improve the ability to analyze and solve practical problems.
5. Cultivate innovative thinking ability: There are often many solutions to math problems, which can cultivate innovative thinking ability and stimulate interest in finding new ideas and methods.