1. If there are units on both sides of the equation, there is no need to put parentheses.

2. If the unit is not written on the left side of the equation, put parentheses when writing the unit on the right side.

For example: 5 angle +3 angle = 8 angle, 5+3 = 8 (angle)

Application problem is to describe relevant facts in language or words, reflect a certain quantitative relationship, and solve unknown problems. Each application problem includes known conditions and problems.

Extended data:

Applied problem analysis method:

1, graphic analysis:

This is actually an intuitive and targeted simulation method, which is widely used in mathematics teaching. Such as engineering problems, travel problems, deployment problems, etc. It is often analyzed by drawing, and students can understand the meaning of the problem through charts, so as to set unknowns and list equations to solve according to the content of the problem. (Example omitted)

2, personal experience method:

For example, swim against the current, swim against the current. Many students have never been on a boat, so it is difficult for them to understand the speed of sailing with the current, against the current and against the current. In order to make students understand, I take cycling as an example (because most students ride bicycles). The students all have personal experience. Riding with the wind is easy, but riding against the wind is difficult. This is the effect of wind speed.

3, intuitive analysis method:

If it is a concentration problem, we should first explain the meaning of percentage concentration and the calculation method of percentage concentration. Secondly, it is important to prepare several cups before class and weigh a certain amount of water and several packets of salt into the classroom for example.

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