简算:4/9*[3/4-(7/16-1/4)]
问题描述:
简算:4/9*[3/4-(7/16-1/4)]
答
4/9*[3/4-(7/16-1/4)]
=4/9*3/4-4/9*(3/16)
=1/3-1/12
=1/4