13分之7×4分之1×5分之6×7分之10
=7/13×1/4×6/5×10/7
=1/13
5分之2×16分之7＋3分之4÷7分之16
=2/5×7/16+4/3×7/16
=7/16×（2/5+4/3）
=7/16×(6/15+20/15)
=7/16*26/15
=91/120
8÷3分之4-4分之18÷0.75
=8×3/4-9/2÷3/4
=8×3/4-9/2×4/3
=6-6
=0