Объяснение:
r45 = R4*R5 / (R4+R5) = 4000*5000 / (4000+5000) = = 2222 Ом
r345 = R3+r45 = 3000 + 2222 = 5222 Ом
r2345 = R2*r345 / (R2+r345) = 2000*5222 / (2000+5222) == 1446 Ом
Rdb = R1+r2345 = 1000+1446 = 2446 Ом
Объяснение:
r45 = R4*R5 / (R4+R5) = 4000*5000 / (4000+5000) = = 2222 Ом
r345 = R3+r45 = 3000 + 2222 = 5222 Ом
r2345 = R2*r345 / (R2+r345) = 2000*5222 / (2000+5222) == 1446 Ом
Rdb = R1+r2345 = 1000+1446 = 2446 Ом