3分之2*2分之15-(1
问题描述：
3分之2*2分之15-(1
(5分之1+10分之33*30分之1-8/300）/4分之1=
答
( 1 ) 2/3*15/2-(1+1/5)/(3/10)
=5-(6/5*10/3)
=5-4
=1
( 2 ) (1/5+33/10*1/30-8/300)/(1/4)
=(1/5+11/100-8/300)*4
=(31/100-8/300)*4
=85/300*4
=(4*85)/(20*15)
=17/15