（3.75×1又5分之3—3又10分之3）÷10分之9
=((15/4)×(8/5)-33/10)×(10/9)
=(6-33/10)×(10/9)
=(27/10)×(10/9)
=3;
［4又7分之5―（7分之5＋1又4分之3×2）］÷2.5
=(4+5/7-5/7-(7/4)×2)÷2.5
=(4-7/2)÷2.5
=0.5÷2.5
=0.2;
99.99×2.8＋0.01×2.8
=2.8×(99.99+0.01)
=2.8×100
=280;
13分之8÷10分之9×11分之4÷9分之5×2分之11÷13分之4
=(8/13)×(10/9)×(4/11)×(9/5)×(11/2)×(13/4)
=2×2×2
=8;
5分之4×11分之4＋11分之5×5分之4
=(4/5)×(4/11+5/11)
=(4/5)×(9/11)
=36/55;
（3分之1＋9分之4）×36
=36×(1/3)+36×(4/9)
=12+16
=28;
3分之2×［（8分之5＋4分之3）÷8分之5］
=(2/3)×(1+6/5)
=(2/3)×(11/5)
=22/15;
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