1/3*3/4-1/2*1/3 = 1-2/3-1/4
1/2*3+1/3*4+1/4*5=3/2*1/5
1/2*2/3*...*49/50=1-49/50
65/6=10+5/6
2/3:8/9=3/4
1+1/5+2+2/5+3+3/5=(1+1/5):1/6
11/5:2=5+7/10-4-3/5
4+2/3+2+2/3=3+2/9+4+1/9
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