3.1/2+2.2/5:1.1/5
3.1/2+(12/5:6/5)
7/2+(12/5×5/6)
7/2+2/1
KPK=2
7/2+4/2=11/2 (B)
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3.1/2+2.2/5:1.1/5
3.1/2+(12/5:6/5)
7/2+(12/5×5/6)
7/2+2/1
KPK=2
7/2+4/2=11/2 (B)