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b) 4*1/3-1/3=4/3-1/3=1
c) 4i1/3-1/3=4
d) 2i2/5-3i4/10=2i4/10-3i4/10=-1
e) 13/21*84/52=52/84*84/52=52/52=1
f) 3i1/11*11/17=34/17=2
g) 1/3:5/3:7/5:9/7:11/9=1/5:7/5:9/7=1/7:9/7=7/63=1/9