k,,+k 202=m(0n+b LLK,a,-L2k2a2=120 a1=-(-5)=B+ 将 代入,则 O B ∑ k1+k2)+(Lk-12)0一k=m(+0) ∑ L1k1-L2k2)+(12k1-12k2)-L1k16=10n 8/248/24