17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
问题描述：
17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
答
17/20×2/3+17/20×1/3-1/2
=17/20×（1/3+1/3）-1/2
=17/20-1/2
=7/20
(3/4-4/9)×36
=3/4×36-4/9×36
=27-16
=11