已知函数f(x)= (x<－2). (1)求f(x)的反函数f-－1(x); (2)设a1=1, =－f－-1(an)(n∈N*),求an; (3)设Sn=a12+a22+…+an2,bn=Sn+1－Sn是否存在最小正整数m,使得对任意n∈N*,有b
—Which of the two dictionaries will you buy? —I will buy ______,for I’ve got some such dictionaries. A. both B. either C. no one D. neit
We should learn to manage our own things________(恰当地)
如图，已知点P是射线ON上一动点（即P可在射线ON上运动），∠AON=30°，当∠A=______时，△AOP为直角三角形．
我国著名的饮料企业王老吉原先的广告语是“健康家庭永远相伴”，缺乏个性的广告语，没有让企业的产品销售有多大起色。后来，王老吉提出了“怕
．He thought she was a pretty girl_______poorly she was dressed. A．how B．as though C．as long as D．however
党和国家之所以重视和帮助少数民族地区发展经济，是为了（） A．贯彻党的民族区域自治政策 B．实现各民族平等 C．加强民族团结 D．促进各民族共同
单项选择。 –_________ is he? –He’s fourteen. A. How big B. How old C. How many D. How much
的展开式中
项的系数是（ ）
B．
D．
