s+4 s+4 k 3|1 6,k2 S+ S+ 1.6 F(s)=2+[,+-2] S+1 S+ F(s)>26()+(3e-e2)E(t)) ( ) 2 5 ( ) 2 ( ) (3 2 3 F s t e e t t t   − −   + − ] 2 3 5 1 6 [ 2 1 ( ) 2 + − + + = + s s F s 5 2 1 2 5 1 4 6, 2 1 3 2 3 4 2 3 2 1 1 = − − = + + = = = + + = =− =− s s s s k s s k