36*5/8-22 1/2
=22又1/2-22又1/2
=0
7.2*1 1/9
=7.2*10/9
=0.8*10
=8
3 1/13*39*7/80
=40/13*39*7/80
=21/2
=10又1/2
0.8*5/6
=4/5*5/6
=2/3
36*5/8-22 1/2
=22又1/2-22又1/2
=0
7.2*1 1/9
=7.2*10/9
=0.8*10
=8
3 1/13*39*7/80
=40/13*39*7/80
=21/2
=10又1/2
0.8*5/6
=4/5*5/6
=2/3