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a)1/2=+5/8=4/8+5/8=9/8=1 1/2
b)...=10/3 - 5/4= 40/12-15/12=15/12
c)...=3/4*6/9=3/6=1/3
d)...=3/7:1/2=3/7*2/1=6/7
ad.2
...=3 1/2:(2/3+1/2)=3 1/2:(4/6+3/6)=3 1/2:7/6=7/2:7/6=7/2*6/7=3