※ 引述《osirisobelis (osiris￾N￾NN )》之铭言： : 1.use the limit comparison test to determine convergence or divergence? : ∞ : Σ √2n-1/n^2 想请问有根号时要怎处理? : n=1 (√(2n-1))/(n^2) lim ---------------- n→∞ 1/n √(2n-1) = lim -------- n→∞ n √(2 - (1/n)) = lim ------------- = 2 ≠ 0 n→∞ 1 ∞ 1 ∞ √(2n-1) Since Σ --- diverges , Σ -------- diverges by limit comparison test n=1 n n=1 n^2 : 2.change the following from cylindrical to cartesian coordinates : (6,pi/6,-2) : 3.find the slope of the tangent to the curve of intersection of intersection : of the surface 36z=4x^2+9y^2 and the plane x=3 at the point (3,2,2) : 烦请解惑 --

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