Assumption: b=d+di+d42+…+d K ∑(K<,0≤i≤) k=0 将此代入模型方程并整理后可得Assumption: 将此代入模型方程并整理后可得 2 0 1 2 K k=0 = ( , 0 ) K i K k k b d d i d i d i d i K s i s = + + + +    