40*(1/8+1/4-1/5)
=40*1/8+40*1/4-40*1/5
=5+10-8
=7
5/14*49*2/35
=5/2*7*2/35
=5/2*2/5
=1
36*(1/6-1/9)
=36*1/6-36*1/9
=6-4
=2
...
40*(1/8+1/4-1/5)
=40*1/8+40*1/4-40*1/5
=5+10-8
=7
5/14*49*2/35
=5/2*7*2/35
=5/2*2/5
=1
36*(1/6-1/9)
=36*1/6-36*1/9
=6-4
=2
...