—What is 1/2 and 1/3 —It’s ().
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1.—What is 1/2 and 1/3 —It’s ().
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2.1 2 3 4 what will be ___________________________1 ___________________________2 ______________________
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3.已知A、S 1 <S 2 <S 3B、S 2 <S 1 <S 3C、S 2 <S 3 <S 1D、. S 3 <S 2 <S 1
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4.设集合A ={1, 2, 3}, 下列关系R中哪些是等价关系?
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5.1 2 3 2 2 2 1 1 3 3 3 3 3 1 1 2 2 3 2 1 2 3 2 -1 <Enter>
输出结果是_____________________。
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6.求和:S n = 1 × 2 + 2 × 3 + 3 × 4 +…+ n ( n + 1)
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7.( )答案:( ).1 3 ( ).2 4 ( ).3 6 ( ).1 3 2 1 ( ).1 2 3 5 ( ).3 2 3 5 ( ).1 2 1 5 2
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8.已知数列{aS n , a 1 =- 2 3 ,满足 S n 1 S n 2= a n (n≥2) ,计算S 1 ,S 2 ,S 3 ,S 4 ,并猜想S n 的表达式.
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9.已知A、( 1 2 ,1]B、( 1 2 , 3 2 )C、[1, 3 2 )D、[ 1 2 , 3 2 ]
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10.下列各组量子数正确的是( )A.n=3, l=2, m=0, m s =1/2B.n=2, l=2, m= -1, m s = -1/2C.n=4, l=1, m=2, m s = -1/2D.n=3,