x No Plagiarism!xLGjBvCcG6pGL69pnAhyposted 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? 15.158.61.20ns 15.158.61.20da2