3/4*1/5+3/4*2/5+0.75*3/5-3/4简便运算

问题描述:

3/4*1/5+3/4*2/5+0.75*3/5-3/4简便运算

3/4*1/5+3/4*2/5+0.75*3/5-3/4
=3/4*(1/5+2/5+3/5-1)
=3/4*(1/5)
=3/20