666···6*999···9(2001个6 2001个9)简便算法要简便算法 每一步都要写出来!快

666···6*999···9(2001个6 2001个9)简便算法 666···6*999···9(2001个6 2001个9)简便算法要简便算法 每一步都要写出来!快 6×9=54 66×9= 666×9= 666‘······十个六×6 计算999···9*999···9+1999···9 999···9代表2005个9 急·····················1+2+3+...+999=? 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? ···· · · · ···· 将下列每个3*3正方形内的九格以及横竖九格均填入一至九的数字,且不重复.· 8 9 · 2 ··1··· 1 ··· 3······· 6 7········· 8 2·········5 ···· 7 ··············· 9 8 ····7 · ·········· ·········· 四年级下册语文第9课主要内容简便完整,很急啊···························· 人教版9年级语文【基础训练】55和56页的题目怎么做··························是56和57页的 9年级上册·················································· 求··············· 什么植物有应激性只要植物名 ·········································································································