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某高校在2008年9月初共有m名在校学生,其中有n名新生,在9月底,又补录了b名...
某高校在2008年9月初共有m名在校学生,其中有n名新生,在9月底,又补录了b名学生,则新生占学生的比例 (选填“变大”、“变小”或“不变”),其理论论据用数学形式表达为 .
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对任意正整数x、y都有f(x+y)=f(x)•f(y),且
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,则f(1)+f(2)+…+f(2008)=( )
A.1-
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B.
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C.
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D.
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某师范大学的数学教育专业有6名青年志愿者,为响应团中央发起的中国青年志愿者扶贫接力计划,志愿到某市的A县、B县、C县三个县任教五年,则一县4名,另两县每县1名的概率为( )
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已知
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,命题p:关于x的方程
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没有实数根,命题q:
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,则命题p是命题q的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
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二次函数
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的图象是抛物线,其焦点的坐标是( )
A.(0,1)
B.
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C.
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D.
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(理) 已知数列{a
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A.
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B.
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C.
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D.
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