7又7分之3×39分之8
=52/7×8/39
=32/21
1又3分之1÷1.4÷1又7分之1
=4/3×5/7×7/8
=5/6
2分之1+（11.7+8.4×1又10分之3）÷1又10分之3
=1/2+（11.7+8.4×13/10）×10/13
=1/2 + 11.7×10/13 + 8.4
=1/2 + 9 + 8.4
=17.9
1又3分之1÷2又5分之2÷1又7分之1
=4/3×5/12×7/8
=35/72
8分之1×5.3+0.125×4.7
=1/8×5.3+0.125×4.7
=1/8×10
=1.25