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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一道直线与圆锥曲线关系O为坐标原点,M(1,-3),N(5,1),C满足OC=tOM+(1-t)ON(向量),C的轨迹与抛物线y^2=4x交于A,B1)求证:OA垂直OB2)X轴上是否存在P(m,0),使得过点P任作抛物线的一条弦,并以该弦为直径的圆都
【,advance,attendant,insert,deposit,chain,burden,pet)选填Withoutfriends,hefelt__inthecityhequalityofhealthcare(lonely,interrupt,invisible,evidently,advance,attendant,insert,deposit,chain,burden,pet)选填】
【New__inmedicineimprovethequalityofhealthcare(lonely,interrupt,invisible,evidently,preferabladvance,attendant,insert,deposit,chain,burden,pet)选填Withoutfriends,hefelt__inthecityhequalityofhealthcare(lonely,interrupt,invisible,evide】