If p is q: true proposition

If q is p: false proposition

Sufficient conditions for p to be q

p:a>2,b>3,q:a﹢b>5

If p is q: true proposition

If q is p: false proposition

Sufficient conditions for p to be q

P: Integer A is divisible by 5, and Q: The last digit of Integer A is 5.

If p is q: true proposition

If q is p: true proposition

Necessary and sufficient conditions for p to be q

To do this kind of problem, just remember, always stand on the position of conditions, "getting by, not coming back": sufficient conditions; "If you can't get through, you can come back": a necessary condition; "I can get by, I can come back": a necessary and sufficient condition.

Take the first topic as an example. P is the condition and q is the conclusion. Always stand in the position of conditions, if a; -2

In other words, it can't be a