5.下列级数中,条件收敛的是 () .-|||-(A) sum _(n=1)^infty ((-1))^n-1dfrac (n)(sqrt {{n)^3+1}} (B) sum _(n=1)^infty ((-1))^n-1dfrac (n)({2)^n}-|||-(C) sum _(n=1)^infty ((-1))^n-1sin dfrac (1)({n)^2} (D) sum _(n=1)^infty ((-1))^n-1dfrac (1)(n{2)^n}

(4)下列级数中,条件收敛的级数为 () .-|||-(A) sum _(n=1)^infty ((dfrac {1+3i)(2))}^n (B) sum _(

级数 sum _(n=1)^infty dfrac ({(-1))^n}({n)^p} 当 () .-|||-(A) gt 1 时条件收敛; (B) lt pl

A12.1.4 下列级数中,收敛的级数是 __-|||-(A) sum _(n=1)^infty =dfrac (-2)(n) (B) sum _(n=1)^i

18.-|||-在下列无穷级数中,收敛的级数是 ()-|||-A sum _(n=1)^infty (sqrt (n+1)-sqrt (n));-|||-B s

) ,若级数 sum _(n=1)^infty (a)_(n),sum _(n=1)^infty (b)_(n) 收敛,则 sum _(n=1)^infty (

1.求下列幂级数的收敛半径、收敛区间、收敛域.-|||-(1) sum _(n=1)^infty ((-1))^n-1dfrac ({x)^n}({n)^2}

下列级数绝对收敛的是()A.sum _(n=1)^infty dfrac ({(-1))^n+1}(2n+1)B.sum _(n=1)^infty dfrac

证明：级数sum _(n=1)^infty (sin dfrac (1)({n)^2})收敛。证明：级数收敛。

级数sum_(n=1)^infty(3)/(sqrt[3](n^2)+1)收敛A 对B 错二、判断题（共20题，40.0分）50.（判断题，2.0分）级数$\s

1.求下列幂级数的收敛域(或收敛圆):-|||-(1) sum _(n=1)^infty dfrac (1)({2)^n}(x)^2n-1;-|||-(2) s