i(1,2)=i2/i1=Z2/Z1;
i(2,3)=1;
I(3,4)=Z3/Z4;
I(4,5)=1;
i(5,6)=Z5/Z6
i(6,7)=Z6/Z7
i(1,7)=i(1,2)*i(2,3)*i(3,4)*i(4,5)*i(5,6)*i(6,7)=i(1,2)*i(3,4)*i(5,6)*i(6,7)=Z2/Z1*Z3/Z4*Z5/Z6*Z6/Z7=Z2*Z3*Z5/(Z1*Z4*Z7)=30x20x20/(20x60x30)=1/30
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