o.7×11分之3-6.6×5分之3-34÷3分之5＋0.7×11分之9
=o.7×11分之3＋0.7×11分之9-6.6×5分之3-34×5分之3
=0.7×(11分之3＋11分之9)-(6.6+34)×5分之3
=0.7×(11分之12)-40.6×5分之3
=42/55- 609/25
=-6489/275