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定义x⊕y=x3-y,则h⊕(h⊕h)等于( ) A.h3 B.0 C.-h D...
定义x⊕y=x3-y,则h⊕(h⊕h)等于( )
A.h3
B.0
C.-h
D.h
考点分析:
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,
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,若
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与
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平行,则m等于( )
A.-2
B.2
C.
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D.
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已知
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,则cos2α的值为( )
A.
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B.
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设{a
n}是等差数列,且a
1+a
5=6,则a
3等于( )
A.1
B.2
C.3
D.4
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以下命题正确的是
.
①把函数
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的图象向右平移
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个单位,得到y=3sin2x的图象;
②一平面内两条曲线的方程分别是f
1(x,y)=0,f
2(x,y)=0,它们的交点是P(x
,y
),则方程f
1(x,y)+f
2(x,y)=0表示的曲线经过点P;
③ABCD为长方形,AB=2,BC=1,O为AB的中点,在长方形ABCD内随机取一点,取得的点到O的距离大于1的概率为
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;
④若等差数列
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共线.
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某研究小组为了研究中学生的身体发育情况,某学校随机抽出20名15至16周岁的男生,将他们的身高和体重制成2×2列联表,根据表联表的数据,可以有
%的把握认为该学校15至16周岁的男生的身高和体重之间有关系.
| 超重 | 不超重 | 合计 |
偏高 | 4 | 1 | 5 |
不偏高 | 3 | 12 | 15 |
合计 | 7 | 13 | 20 |
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P(K2≥k) | 0.025 | 0.010 | 0.005 | 0.001 |
k | 5.024 | 6.635 | 7.879 | 10.828 |
独立性检验随机变量K
2值的计算公式:
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