5: ﹙50--17.6﹚÷4.5
=32.4÷4.5
=7.2
6: ﹙52.4--12.8﹚÷2×12.8
=39.6÷2×12.8
=253.44
7: 97.5÷5÷1×1×3
=58.5
8: 412.5÷5×5
=247.5
9: ﹙8--4.5﹚×2×6.8
=3.5×2×6.8
=47.6
10: 1.2×1.6÷2
=0.96
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