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a+b=3/2 +2 =3/2 +4/2 =7/2
a xb/(a+b) =3 : 7/2 =3*2/7 =6/7
b=2
3/2*2 3
--------- = ------- = 3: 7/2=3*2/7=6/7
3/2+2 2i3/2