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关于A.等于的百科

设a,b∈R,*{1,a+b,a}=,则b-a等于(  )A.1                      ...
等于(     )A.6     B、-6     C、-9     D、9
等于                                     A.              ...
已知等于                                  A.               ...
+等于                                               (  )A...
等于 A.2                                           B.-2  ...
等于(  )A.-       B.         C.    D.-
.等于(   )A.                B.                C.         ...
等于(  ) A.0                            B.               ...
等于( )A.   B.    C.    D.
等于(  )A.﹣  B.   C.﹣      D. 
  • 等于(  )A.﹣  B.   C.﹣      D. 

  • 问题详情:等于()A.﹣  B.   C.﹣      D.【回答】B【考点】运用诱导公式化简求值;根式与分数指数幂的互化及其化简运算.【专题】计算题;转化思想;三角函数的求值.【分析】由sin120°>0,去掉根号,利用诱导公式即可化简求值.【解答】解:=sin120°=sin60°=.故选:B.【点评】本题主要考查...
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等于(  )A.       B.            C.               D.
等于(  )A.     B.   C.  D.
若,则等于A.                           B.                   ...
设*,*,则等于A.                            B.C.           ...
已知*等于                 (   )      A.                   ...
已知*等于                             A.                  ...
等于                      A.-            B.-             ...
 等于(  )A.    B.     C.     D.
cos(-)等于(  )A.             B.             C.-          ...
在中,,,,则等于              (   )                    A.     ...
若,则等于     (           )      A.         B.             ...
若,则等于                                       (  )A.     ...
等于(   )A.  B.  C.  D.
 的值等于                                 (    )A.         ...