题型:解答题 (14分)已知数列{an}的前n项和为Sn,且an是Sn与2的等差中项,数列{bn}中,b1=1,点P(bn,bn+1)在直线x-y+2=0上。 (1)求a1和a2的值; (2)求数列{an},{bn}的通项an和bn; 查看答案
题型:单项选择题 The Repairer shall be relieved of all obligations under these terms and conditions caused by such all following matters except().A.act of GodB.lock-outC.strikeD.paint fire 查看答案