4X(2/15+1/6)-4/5怎样简便运算
问题描述:
4X(2/15+1/6)-4/5怎样简便运算
答
4X(2/15+1/6)-4/5
=4x(4/30+5/30)-24/30
=36/30-24/30
=6/30
=1/5