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5Â¥2015-11-21 18:42:17
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5Â¥: Originally posted by 0404600213 at 2015-11-21 18:42:17
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Áîrou=exp(t)
r*(r-1*(r-2)*(r-3)+2*r*(r-1)*(r-2)-9*r*(r-1)+9*r=0
r*(r-2)*(r-4)*(r+2)=0
r1=0, r2=2, r3=4, r4=-2
f=A*exp(0*t)+B*exp(2*t)+C*exp(4*t)+D*exp(-2*t)
=A+B*rou^2+C*rou^4+D/rou^2
7Â¥2015-11-21 18:49:58
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