In automobiles, the brake system is an essential part responsible for control of the vehicle. Any failure in the brake system generates subsequent catastro... R Jegadeeshwaran,V Sugumaran - 《Recent Patents on Signal Processing》 被引量: 3发表: 2014年 PRELIMINARY STUDY OF EMA LANDING GEAR AC...
答案解析 查看更多优质解析 解答一 举报 a1=2,S5=17由Sn=n(a1+an)/2 得S5=5(a1+a5)/2=5(a1+a1+4d)/2=5(2+2+4d)/2=17由此可得 d=0.7由此可求出sn和s12 解析看不懂?免费查看同类题视频解析查看解答 更多答案(1) 相似问题 已知数列{An}是等差数列,Sn是其前n项的和,求证S6,S12-S6,S18-...
11.Finally I got my driving license last summer.Mom decided to go with me to take my first trip around an empty parking lot.I knew my mother was an excellent (31)D.She had drivenover 20years without getting one ticket.However.I found that she was no