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There are two sets of mathematics in senior one. Sometimes the results of the two situations have to be combined, but sometimes they have to be submitted. How to divide it?
Together, as long as one situation is satisfied, all situations can be satisfied and all parts can be taken.

Hand in means to meet many situations at the same time, so hand in the public part.

Intersection, such as finding the range of a parameter, by listing several inequalities, enclosing them in curly braces, and then using intersection.

Union, for example, is a problem of finding parameter values. For example, to find a value, you can find a value-1, and at this time you can use 1.

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