雅马哈B16降b调:Jim is_(a,/,an,the)

Jim is_(a,/,an,the) Lin Tao is_(/ a an)Chinese 已知数列{an},a1=1,1/a(n+1)=t/an+1,记bn=1/an+1/(t-1) Jim!_______come in,please. A.No B.Does't C.Not D.Don't Jim doesn\\\'t have a brother___sister? A.and B.and a C. or D. or a Jim doesn\\\'t have a brother___sister? A.and B.and a C. or D. or a Because she hasn't enough mony to buy a present for her husband Jim. a /an 是不是实词 An + 1/An = A(n+1) A1=2 求An通式 A(n+1)=(An^2+An)/2 求An