题目内容

计算
(1)﹣8﹣12+2                      
(2)0.5+﹣(﹣2.75)+
(3)÷
(4)
(5)

解:(1)﹣8﹣12+2
                 =﹣20+2
                 =﹣18;
(2)0.5+﹣(﹣2.75)+(+
       =0.5+0.25+2.75+0.5
       =(0.5+0.5)+(0.25+2.75)
       =1+3
       =4;
(3)÷
          =﹣9+[(﹣)×12+(﹣)×12]
          =﹣9+[(﹣8)+(﹣3)]
          =﹣9﹣11
          =﹣20;
(4)
          =﹣9﹣(﹣
          =﹣9﹣(﹣
          =﹣9﹣(﹣
          =﹣9+
          =﹣8
(5)
        =(﹣100+)×14
       =﹣100×14+×14
       =﹣1400+4
       =﹣1396.

练习册系列答案
相关题目