A = -|5| = -5 ,
B = +1 = 1 ,
C = -(-2) = 2 ,
D = -|-6| = -6 ,
则有:
(1)A-B+C-D = -5-1+2-(-6) = 2 ;
(2)A-(B-C)-D = A-B+C-D = 2 .【 同(1)】
A = -|5| = -5 ,
B = +1 = 1 ,
C = -(-2) = 2 ,
D = -|-6| = -6 ,
则有:
(1)A-B+C-D = -5-1+2-(-6) = 2 ;
(2)A-(B-C)-D = A-B+C-D = 2 .【 同(1)】