ma,af, mohon di jawap dengan caranya

semoga bener ya jawabannya

a. 56 + ( -83 ) = 56 - 83 = -27 .
b. -35 + ( -19 ) = -35 - 19 = -54
c. 26 + ( -38 ) + ( -55 ) = 26 - 38 - 55 = -67
d. -28 + 42 + ( -31 ) = -17
.....
a. 57 - 72 = -15
b. -43 - ( -32 ) = -43 + 32 = -11
c. 44 - 29 - 45 = -30
d. -36 - 27 - ( -63 ) = 126