10-13×1/3:(5×1/3-4×1/3)×(7/5-4/15×3/2)×3/20
=10-13×1/3:(16/3-13/3)×(7/5-12/30)×3/20
=10-39/3:3/3×42/30×3/20
=10-39/3:1×21/15×3/20
=10-39/3×21/15×3/20
=10-2457/900
=10-273/100
=1000/100-273/100
=727/100
=7,27
