用简便方法计算1/27+2/27+3/27+.+26/27=?
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用简便方法计算1/27+2/27+3/27+.+26/27=?
1/27+2/27+3/27+.+26/27=?
=1/27(1+2+3+...+26)
=1/27[(1+26)*26/2]
=1/27*(27*13)
=13
=1/27(1+2+3+...+26)
=1/27[(1+26)*26/2]
=1/27*(27*13)
=13