题目内容

计算:(每小题3分,共12分)
(1)、 3+(-)-(- )+2             (2)、
(3)、    (4)、
(1)6(2)8(3)1(4)0
解:(1)原式= 3-+ +2              解:(2)原式= -2×+8+
=" 3+" +2                                   = -+8+ 
=" 3+" 3                                         =" 8"
=" 6"
解:(3)原式= 1×5+12-16  (1分)         解:(4)原式= 16÷(-8)-(-)×16
=" 5+" 12-16                                       =" -2+2"
= 17-16                                          =" 0"
=" 1"
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