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=2 13/12=37/12
2).2/3+3 5/9=3+(2/3+5/9=6/9+5/9=11/9)
=3 11/9=38/9
3).2/3+2 1/2+3 1/4
=2+3(2/3+1/2+1/4=8/12+6/12+3/12=17/12)
=5 17/12
=77/12
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