Current location - Training Enrollment Network - Mathematics courses - What is 99-9?
What is 99-9?
99-9 equals 90.

Subtraction is one of the four operations, and the operation of subtracting one number from another is called subtraction; Given the sum of two addends and one of them, the operation of finding the other addend is called subtraction. The symbol of subtraction is "-",which is pronounced as negative sign.

Learning math skills:

1. Mathematics needs to be done with heart. It is difficult for impetuous people to learn mathematics well, and it is the last word to do the problems in a down-to-earth manner.

If you want to learn math well, you can't do it without thinking. You can't hide when you encounter problems, and you can't stop until you figure it out.

3. The most important thing in mathematics is the problem-solving process. It is important to know mathematical thinking. With clear thinking, mathematics is naturally learned.

Math is not for looking, but for calculating. Maybe you didn't think for a second, and when you pick up the pen and start calculating, you will be suddenly enlightened.

One of the reasons why math problems can't be done is that the examples are not clearly studied, so the examples in math books must not be missed.