9/11乘(3/5-3/7+2/5-4/7)
问题描述:
9/11乘(3/5-3/7+2/5-4/7)
最好是简便运算
答
9/11乘(3/5-3/7+2/5-4/7)
=9/11×(3/5+2/5-3/7-4/7)
=9/11×(1-1)
=0