Direct Violet 9, disodium salt; Direct Violet 9; disodium (3Z)-3-({2-methoxy-5-methyl-4-[(E)-(4-sulfonatophenyl)diazenyl]phenyl}hydrazono)-4-oxo-7-(phenylamino)-3,4-dihydronaphthalene-2-sulfonate CAS号:6227-14-1 EINECS号:228-326-0 分子式:C30H23N5Na2O8S2 分子量:691.6419 InChI:...
a(n+1)=2an²两边取对数得lna(n+1)=ln2+2lnan所以lna(n+1)+ln2=2(lnan+ln2)所以数列{lnan+ln2}是等比数列首项是lna1+ln2=ln1+ln2=ln2公比是q=2所以lnan+ln2=ln2*2^(n-1)即ln2an=ln[2^2^(n-1)]所以2an=2^2^(n-1)... 解析看不懂?免费查看同类题视频解析查看解答 ...