算I1, I2, I3, VAB, VAE, 和 VCE
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1)Vae = U1,Vce = U2;
2)
I1*(R1+R3) + I' *R3 = U1;
I' *(R2+R3) + I1 *R3 = U2;
解得:I1,I';那么 I2 = I1 + I';Vab = I1 *R1 = 25/4 (V);
3)I3 *(R4 + R5//R6)= U2;解得 I3 = 1 mA;
你明白了么