14分之9×6分之5÷16分之15
=9/14×5/6÷15/16
=45/84×16/15
=4/7
3分之2÷4分之3－3分之2×4分之3
=2/3×4/3-2/3×3/4
=8/9-1/2
=16/18-9/18
=7/18
2.5×5分之4＋0.25×2
=2.5×4/5+1/4×2
=2+1/2
=2.5