(2005•四川)计算:2cos45°-(-2)+-. |
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(2005•苏州)不使用计算器,计算: |
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(2005•泰州)计算:-12005-(1+0.5)×3-1÷(-2)2+(cos60°-). |
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(2005•无锡)(1)计算:; (2)解不等式组:. |
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(2005•盐城)计算:cos60°+--2-1. |
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(2005•扬州)(1)计算:; (2)已知:如图,点E是正方形ABCD的边CD上一点,点F是CB的延长线上一点,且EA⊥AF.求证:DE=BF. |
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(2005•玉林) |
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(2005•镇江)计算: |
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(2005•中原区)(1)计算 (2)已知实数a满足a2+2a-8=0,求的值. |
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(2005•湘潭)在4张小卡片上分别写有实数0、、π、,从中随机抽取一张卡片,抽到无理数的概率是 . | |