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3 i 1/2-3 i 1/6:(-2 i 1/9)=7/2-19/6:(-19/9)=7/2-19/6*(-9/19)=7/2+3/2=10/2=5
-1 i 1/7*1 i 11/24:3/5=-8/7*35/24*5/3=-5/3*5/3=-25/9=-2 i 7/9
b) 1/2
c) -1 2/3