Calculation (- 3 / 2) - (- 5 / 4) - (+ 7 / 2) - (21 / 4) + (9 / 4) There should be a calculation process

Calculation (- 3 / 2) - (- 5 / 4) - (+ 7 / 2) - (21 / 4) + (9 / 4) There should be a calculation process

(-3/2)-(-5/4)-(+7/2)-(21/4)+(9/4)
=-3/2+5/4-7/2-21/4+9/4
=（-3/2-7/2）+（9/4+5/4-21/4）
=-5-7/4
=-6 and 3 / 4

Help to find the domain of function, thank you
Finding the domain of y = ln (sin (x / π))

Because the definition field of function y = LNX is x > 0
So sin (x / π) > 0
According to the definition field of function y = SiNx,
2K π < x / π < 2K π + π, where k is an arbitrary integer
So, 2K π ^ 2 < x < 2K π ^ 2 + π ^ 2, where k is any integer

Let d = [0,1] be the domain of F (SiNx)?

If the domain D of F (x) is [0,1], then:
0