8分之5×【（4分之3-2分之1）÷12分之5】要简便
问题描述：
8分之5×【（4分之3-2分之1）÷12分之5】要简便
答
5/8×[(3/4-1/2)÷5/12]
=5/8×(3/4-1/2)÷5/12
=5/8×(3/4-1/2)×12/5
=5/8×12/5×(3/4-1/2)
=3/2×(3/4-1/2)
=3/2×1/4
=3/8