limx趋向于-1(3x^2-5x-2)/（4x^2-2x+1）的极限

limx趋向于0(2x-1)^5/((2x+1)^2(1-3x)^2) 计算极限：limx趋向于无穷,[（5x^2+1）/(3x-1)]sin1/x limx趋向于2 ,5x/x^2-4=? limx^3+2/3x+4 x趋向于无穷? 高数求极限 limx趋向于3 (1-X/3)的1/x-3次方limx趋向于3 (X/3)的1/x-3次方limX趋向于无穷 （X-2/X+2）的X次方 limx趋向于0,ln(1+2x)/xsinx 计算limx^2y/x^2+y^2,x趋向于0.y趋向于1~ limx趋向于-1(3x^2-5x-2)/（4x^2-2x+1）的极限 求极限limx趋向于1x^2+2x+5/x^2+1 limx趋向于无穷时4x^3-2x+8/3x^2+1 limx趋向于3（x^2-5x+6/x-9）如何解啊 limx趋向于无穷 (x+1/x+3）∧2x limx方-3分之x方+x+2,x趋向于1 limx趋向于2时,(x^2-3x-5) 如何计算? 求极限：limx趋向于0 (e)^(x)^2-1/ln(1+3x^2) 求极限,limx趋向于正无穷ln(1+3^x)/(1+2^x) 已知limx^2+ax+b/x-1=3(x趋向于1),求a, limx趋向于0,x^2/ln(1-3x)=?