(全國聯(lián)考模擬)數(shù)列的前n項(xiàng)和，數(shù)列滿足：，當(dāng)n≥2時(shí)，，設(shè)數(shù)列的前n項(xiàng)和為，則=________．

(2005湖北，15)設(shè)等比數(shù)列的公比q，前n項(xiàng)和為、若成等差數(shù)列，則q的值為________．

(2008上海春，9)已知無窮數(shù)列的前n項(xiàng)和，則數(shù)列的各項(xiàng)和為________．

(廣東六校聯(lián)考模擬)數(shù)列中，且數(shù)列是等差數(shù)列，則=________．

(南通中學(xué)模擬)已知前n項(xiàng)和為，則的前n項(xiàng)和=________．

(2007蘇錫常鎮(zhèn)四市模擬)數(shù)列滿足遞推公式，又，則使得為等差數(shù)列的實(shí)數(shù)=________．

(2007北京宣武模擬)設(shè)表示等差數(shù)列的前n項(xiàng)和，且若，則n=________．

(2006浙江，11)設(shè)為等差數(shù)列的前n項(xiàng)和，若，則公差為________(用數(shù)字作答)．

(2007全國Ⅰ，15)等比數(shù)列的前n項(xiàng)和為，已知成等差數(shù)列，則的公比為________．

(2005全國Ⅰ，13)若正整數(shù)m滿足，則m=_______(lg 2≈0.3010)．