①Jane blackboard morning look at open the door sit down
②Please look at the window. OK, Miss Fang.
已知数列{an}满足2Sn=4an﹣1.则数列{ 1log2an+3log2an+2 }的前100项和为( )
如图,从边长为(a+4)cm的正方形纸片中剪去一个边长为(a+1)cm的正方形(a>1),剩余部分沿虚线又剪拼成一个矩形(不重叠无缝隙),则矩形的面积为( )