作业帮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
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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
要简便算法 每一步都要写出来!快
666···6*999···9(2001个6 2001个9)简便算法要简便算法 每一步都要写出来!快
666……×999……
=666……×(1000……－1）
=666……(2001个6)000……(2001个0)－666……(2001个6）
=666……(2000个6)5333……(2000个3)4
666···6*999···9=666···6*(100...0-1)=666···600...0-666···6=666···65333...34(2000个6,2000个3）
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 ·····?······?··········?
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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 ·
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