2.25×3/5+2.75÷1又2/3+60%

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2.25×3/5+2.75÷1又2/3+60%

2.25×3/5+2.75÷1又2/3+60%
=2.25×3/5+2.75×3/5+3/5
=3/5×(2.25+2.75+1)
=3/5×6
=18/5