①1/12×1/4×72×4
=1×6
=6
②1/15×1/23+1/23×14/15
=1/23(1/15+14/15)
=1/23×1
=1/23
③35/32×32÷(1/8+6/8)
=35÷7/8
=35×8/7
=40
注：1/12的意思是十二分之一