（5/6-5/9）×36 =5/6*36-5/9*36=30-20=10
（24＋1/5）×5/6
=24*5/6+1/5*5/6
=20+1/6
=20又1/6
15/17×4/5×17/30
=15*4*17/17*5*30
=4/10
=2/5
5/7×6/13＋7/13×5/7
=5/7*(6/13＋7/13)
=5/7*1
=5/7
39×3/38
=(38+1)*3/38
=3+3/38
=3又3/38
（1/2＋1/7）×2×7
=1/2*2*7+1/7*2*7
=7+2
=9
（5/6-5/9）×36 =5/6*36-5/9*36=30-20=10
（24＋1/5）×5/6
=24*5/6+1/5*5/6
=20+1/6
=20又1/6
15/17×4/5×17/30
=15*4*17/17*5*30
=4/10
=2/5
5/7×6/13＋7/13×5/7
=5/7*(6/13＋7/13)
=5/7*1
=5/7
39×3/38
=(38+1)*3/38
=3+3/38
=3又3/38
（1/2＋1/7）×2×7
=1/2*2*7+1/7*2*7
=7+2
=9