5/6-3/8×5/6-5/8×5/6
=5/6-5/16-5/8×5/6
=5/6-5/16-25/48
=25/48-25/48
=0/48
简便计算5/6-3/8×5/6-5/8×5/6=（1-3/8-5/8）x5/6=0x5/6=0
