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E=U1+(U1/R1)(E-U2)R2/U2EU2R1=R1U1U2+U1R2E-U1R2U2EU2R1-U1R2E=R1U1U2-U1R2U2(U2R1-U1R2)E=R1U1U2-U1R2U2E=(R1U1U2-U1R2U2)/(U2R1-U1R2)E=U1U2(R1-R2)/(U2R1-U1R2)