计算下面各题.能简算的要简算. (1)++ (2) (3)+++ (4)1 (5)8 (6)-+ (7)-(+) (8)-+ (9)-(-)

小学数学题库 2025-08-29 00:25:20
计算下面各题,能简算的要简算。
(1)++ (2)--(3)+++
(4)1--(5)8--(6)-+
(7)-(+(8)-+(9)-(-
(1)++
  =+
  =1
(2)--
  =-
  =
(3)+++
  =+1
  =1
(4)1--
  =-
  =
(5)8--
  =8-1
  =7
  
  
(6)-+
  =+
  =
(7)-(+
  =-
  =
(8)-+
  =1-
  =
(9)-(-
  =-
  =