For example, why does 1 complement 10 equal 1, and why does 2 Complement 10 equal 2?

For example, why does 1 complement 10 equal 1, and why does 2 Complement 10 equal 2?

This problem should not be difficult. I think you can solve your problem by dividing a number by 10. 1 divided by 10 equals 0 times 10 plus 1, so 1 remainder 10 equals 1; 2 divided by 10 equals 0 times 10 plus 2, so 2 remainder 10 equals 2,

Simplification (1) + (- 72) (2) - (+ 6.3) (3) - {+ (- 10)} [below]
（4）-【-（+2/3）】
2： When simplifying - (- 100), the following two have their own reasons. Whose method is right?
A: - (- 100) means the opposite number of - 100, because the opposite number of - 100 is 100, that is - (- 100) = 100
B: - (- 100) means the opposite number of the opposite number of 100, because the opposite number of 100 is - 100, and the opposite number of - 100 is 100, that is - (- 100) = 100

A

1.√1+2sin650°cos430°/sin290°+cos790°
2. Cos (α - 4 π) / sin (18 π + α) times Tan (α - 2 π) times cos6 π

1. 1 + 2sin-70cos70 / sin-70cos70 = 3
2. Cos6 π gets 0. That's right /?