如题所述
25×27×(25×1/26+26×1/27)
=25×27×(25/26+26/27)
=25×27×25/26+25×27×26/27
=25×(26+1)×25/26+650
=25×(26×25/26+1×25/26)+650
=25×(25+25/26)+650
=25×25+25×25/26+650
=625+650+(26-1)×25/26
=1275+26×25/26-1×25/26
=1275+25-25/26
=1300-25/26
=1299又1/26
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