1、20192020120150(60)()()()(22dbcadcbabcadnk+=,)(dcban+=)(02kKP0.250.150.100.050.0250.0100.0050.0010k1.3232.0722.7063.8415.0246.6357.87910.8285601.A.B.C.D.2.=+)43()2()55(iiiA.i2B.i10C.10D.23.ii+11AiBiC2D24.xyx0134y2.24.34.86.7yxaxy+=95.0aA.0.325B.0C.2.2D2.65.,11,22,5,252A.6B.7C.19D.116.0Ra02 aA.B.C.D.7
2、.确定结论“XY 有关系”的可信度为95%2kkA.10.828B.6.635C.3.841D.2.7068.z|zz=zA.0B.0C.0D.09.ABCD10.0zyxxzczybyxa111+=+=+=cba()A2B2C2D211.“垂直于同一条直线的两条直线互相平行”的性质，可推出空间下列结论：ABCD12nannS11a=2nnSn a=*()nNnSA21nn+B311nn+C212nn+D22nn+52013.Ryx,iyxi=+2=yx.14.20.960.8515.用反正法证明“233=+ba2+ba”16.),(00 yxr22020)()(ryyxx=+),(000zyxPR.67017.10)3276.18.12mimmmz)2(122+=(1)(2)(3)19.12ABCDCDCB=BDADFEABBD1/EFACD2BDEFC20.121984115,2019115 套纪念币“双遗产之泰山币”是目前为止发行的第一套异形币，因为这套纪念5040244020225012%121.1220072011(1)yx(2)2012xbyaxnxyxnyxbniiniii,1221=22.12nannS)1(21nnnaaS+=.1321,aaa21na3nS.x+200701234y5781119
