lim(3*x^2+5)/(5x+3)sin(2/x)=多少?

lim sin 2x / sin 5x lim arctan x / x 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 当x趋向π lim (sin 3x )/( sin 2x) 的极限为? lim(tan^3(3x)/(X^2sin(2x))(x趋近于0） x趋向于无穷时 lim (3x-1)/(x^3 乘以 sin(1/x^2 )) lim(x趋于无穷)2x+3/5x+4等于多少 lim(x→0) (5x+sin^2 x -2x^3)/(tanx+4x^2) 用等价无穷小怎么算 求极限 1,lim(x→∞）（sinx/x +100) 2,lim(x→∞）xtan1/x 3,lim(x→1）sin^ 求解sin(x)+lim(x→-∞)+2/x*[x,(x+2)*3]/x+x6+x2/(x+[x,x2+2x])+√x lim(x趋于0）：5x+(sinx)^2-2x^3/tanx+4x^2 等于多少 已知lim(x→0）[f(3x)/x]=3 求lim(x→0) [2x/f(5x)] 求极限lim (3x^3+5x^2+x) / (7x^3+5x-4)