Question

几道道数学题

Answer 1

1 D1-1/2-1/20-1/200=(1/200)(200-100-10-1)=89/2002 A2008/2007=1+(1/2007)2007/2008=1-(1/2008)2009/2008=1+(1/2008)2008/2009=1-(1/2009)4 C只会轮滑+只会游泳+二者都会+二者都不会=总数轮滑(40-12-8)*3/(3+2)=12...