8/49/[9/8-(1/8+3/7)]=要过程

问题描述:

8/49/[9/8-(1/8+3/7)]=要过程

8/49/[9/8-(1/8+3/7)]
=8/49÷[9/8-1/8-3/7]
=8/49÷(1-3/7)
=8/49×7/4
=2/7