数学推荐
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1,13,24,27,37,43,59,79,64,85这些数中,质数和合数有哪些?速求!
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证明两个集合相等,A={X|x=2n+1,n属于整数},B={x|x=4n+-1,n属于整数},求证A=BPS,4n+-1就是指4n+1和4n-1.答案上是设x属于A,然后x=2n+1(n属于整数),当n=2M时,(m属于整数),x0=4m+1;当n=2m-1(m属于整数),x=4m-1
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