习题答案 (仅供参考,不对之处敬请批评指正,谢谢!) (说明:书中有印刷错误的习题,在此无法给出答案,请谅解。28章习题答案联系人王凤如,xwfr@sohu.com) 2-2(a)min(t)=fl[;(t)-x()-/2x() 即:mx0(t)+(f+f2)x0(t)=f1x;(t1) (b)f(k+k2)o(t)+k k2xo(t)=k2fi(t (c)o(t)+(k1+k2)xo()=()+k1x(t 2-3(a)R1R2C1C2i0(t)+(R1C1+R2C2+R1C20(t)+u0(t) =R1R2C1C2i1(t)+(R1C1+R2C2;(t (b)f1f2o(t)+(fikit fik2+)xo(t)+kikyo(t) =ff2x;(1)+(fk2+f2k1)x1(t)+k1k2x2(t) 2-4(a)rr, Cuo(t)+(R/+r2 uo(t)=rr Cui (t)+Rui(t) (b)R'CC2io(t)+(RC2 +2RCuio(t)+uo(t) RCIC2ui (t)+2RCui(t)+u,(t)习题答案 2-2(a) ( ) [ ( ) ( )] ( ) 1 2 mx t f x t x t f x t o i o o  =  -  -  即： mx (t ) ( f f )x (t ) f x (t ) o 1 2 o 1 i  + +  =  (b) f ( k k )x (t ) k k x (t ) k fx (t ) 1 2 o 1 2 o 2 i +  + =  (c) ( ) ( ) ( ) ( ) ( ) 1 2 1 fx t k k x t fx t k x t o + + o = i + i   2-3(a) R R C C u (t ) ( R C R C R C )u (t ) u (t ) o + + + o + o   1 2 1 2 1 1 2 2 1 2 (b) f f x (t ) ( f k f k f k )x (t ) k k x (t ) 1 2 o + 1 1 + 1 2 + 2 1 o + 1 2 o   2-4(a) R R Cu (t ) ( R R )u (t ) R R Cu (t ) R u (t ) 1 2 o + 1 + 2 o = 1 2 i + 2 i   (b) R C C u (t ) ( RC RC )u (t ) u (t ) o + + o + o   1 2 2 1 2 2 （仅供参考，不对之处敬请批评指正，谢谢！） （2-2题~2-4题） ( ) 2 ( ) ( ) 1 2 1 RC C u t RC u t u t = i + i + i   f f x (t ) ( f k f k )x (t ) k k x (t ) = 1 2 i + 1 2 + 2 1 i + 1 2 i   R R C C u (t ) ( R C R C )u (t ) i i   = 1 2 1 2 + 1 1 + 2 2 （说明：书中有印刷错误的习题，在此无法给出答案，请谅解。2~8章习题答案联系人王凤如，xwfr@sohu.com）