0504 If statement (judging the marriage condition and the unary two-time equation)

Case LIST:

First, the conditions of marriage, have a room? You got Money? Are you capable?

Train of thought: 1, if have room, can marry

2, if there is no room, ask the second condition of money, if there is, can be married

3, if no room without money, then ask the third condition has the ability, if there is, can marry

4, if the above three conditions are not, then bye

Second, Judge A*x*x+b*x+c=0 whether the equation is a two-dimensional equation, and determine the root of the situation

Ideas: 1, first understand what is called a two-time equation, when a is not equal to 0, this equation is a two-time equation

2, according to the formula Derta=b*b-4*a*c to determine the root of the situation

①derta>0, the equation has two unequal real roots

②derta=0, the equation has two equal real roots

When ③derta<0, the equation has no real roots

3, first of all to determine whether this equation is a two-time equation, if it is, in judging the root of the situation

0504 If statement (judging the marriage condition and the unary two-time equation)