10.已知正项数列{an}\{a_{n}\}{an}中,a1=1,an+12−an2=1{a_1}=1,a_{n+1}^2-a_n^2=1a1=1,an+12−an2=1,则数列{1an+an+1}\left\{{\frac{1}{{a_n}+{a_{n+1}}}}\right\}{an+an+11}的前120项和为((( )))