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E₂ = 5V 1₁ =1₂=13=22 E₂=9V R3=1292 R₂=42 E₁ = 4V R₁ = 82 11, 12, 13 = R3 1₂ E2r2 R₁ 13 IC 44 E3r3 R₂ E₁ ri I₁ 4₁​