x No Plagiarism!b1mAh16agzgUfrEYmqi9posted on PENANA 暑假輔導,數學複習有個單元叫數列, 有等差等比之類的, 數學老師就說:想知道a10就去問a9,想知道a9就去問a8…就像松下問童子…… 朕:喵喵喵?216.73.216.250ns216.73.216.250da2