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a. 1/6*42=7
b. 2/3*60=40
c.5/6*20= 50/3= 16i2/3
d.4/5*12= 48/5=9i3/5
2.
a. 2/5*3/8= 3/20
b. 3*2/5= 6/5= 1i1/5
c. 2*1i3/5= 2*8/5= 16/5=3i1/5
d. 2i2/3*1i1/6= 8/3*7/6= 28/6= 4i4/6= 4i2/3
3,
a. 2i2/5*(2-1i7/12)= 12/5*(1i12/12-1i7/12)= 12/5*5/12= 1
b. 1i1/7*1i3/4-3i1/5*1/4= 8/7*7/4-16/5*1/4= 2-4/5= 1i5/5-4/5= 1i1/5