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已知整数对的序列如下:(1,1),(1,2),(2,1),(1,3),(2,2)...
已知整数对的序列如下:(1,1),(1,2),(2,1),(1,3),(2,2),(3,1),(1,4),(2,3),(3,2),(4,1),(1,5),(2,4)…,则第60个数对是 .
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给出下列四个命题;其中所有正确命题的序号是
①函数f(x)=x|x|+bx+c为奇函数的充要条件是c=0;
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已知向量
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+
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-3
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已知三个不等式:①ab>0;②
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