Why is 101-102 equal to 1? Do not change the number, only change the nature of the subtraction. Don't answer!

Why is 101-102 equal to 1? Do not change the number, only change the nature of the subtraction. Don't answer!

Take 101 eggs and smash 102 eggs, only one egg survived

Look at the following equation: 1 by 2 equals one-third by 1 by 2 by 3, 1 by 2 plus 2 by 3 equals one-third by 2 by 3 by 4
One times two plus two times three plus three times four equals one-third times three times four times five, one times two plus two times three plus three times four plus four times five equals one-third times four times five times six
According to the above rule, please guess: 1 times 2 plus 2 times 3 plus 3 times 4 plus 4 times 5 plus. Plus N times (n plus 1) equals

One third times N times (n + 1) times (n + 2)

Fill in the brackets of the equation 3 times () - 2 times () = 15 to make the two numbers opposite to each other, and the equation holds

3 -3

3 times () + 2 times () = 15. Fill in 1 number in brackets to make the two numbers opposite to each other, and the equation holds

3 times (15) + 2 times (- 15) = 15