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Гуру
(2932)
15 лет назад
p=r*i*i=0.75
i=u/(r+1)
p=i^2*r
p=r*(u^2)/(r+1)^2
r*(u^2)=0.75*(r+1)^2
4*r=(3/4)*(r^2+2*r+1)
(3/4)r^2 +(3/2)r+(3/4)-4r=0
3r^2 +6r+3-16r=0
3r^2 -10r+3=0
D=100-4*9=64
R1=(10-8)/6=1/3
R2= (10+8)/6=3
I1=2/(1+1/3)=3/2
I2=2/(1+3)=1/2