1. In rational number subtraction, the minuend is not necessarily greater than subtraction or difference (right).

(The minuend can be less than or equal to the sum and difference of the minuend)

2. If you subtract a negative number, the difference must be greater than the minuend (pair).

(Subtracting a negative number is equivalent to adding a positive number)

3. If you subtract a positive number, the difference is not necessarily less than the minuend (error).

(Must be less than)

Hehe, come on! If you don't understand anything, ask again and answer honestly!