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1i(5/9) : (-2i(1/3))=14/9 : (-7/3)=14/9 * (-3/7)=-(14*3)/(9*7)=-42/63=-(6*7)/(9*7)=-6/9=-2/3
3i(1/4)*(-0,4) + 3i(1/4)*(-15,6)=(13/4)*[(-0,4) + (-15,6)]=(13/4)*[(-0,4)-(15,6)]=
(13/4)*(-16)=-4*13=-52