2又3/4 1又5/9 2.25 3又4/9

2又3/4+ 1又5/9 +2.25+ 3又4/9

2又3/4+1又5/9+2.25+3又4/9
= (2.75+2.25)+(1又5/9 +3又4/9)
=5+5
=10
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