limx^3+2/3x+4 x趋向于无穷?

limx趋向于无穷x^2+2x-4/x^3-x^2 limx趋向于无穷时4x^3-2x+8/3x^2+1 limx趋向于无穷2x^2-4/3x^2-x 计算极限：limx趋向于无穷,[（5x^2+1）/(3x-1)]sin1/x 求极限,limx趋向于正无穷ln(1+3^x)/(1+2^x) limx趋向于无穷x²+x/x的4次-3x²+1求极限 利用洛必达法则求limx趋向于正无穷lnx/x^3 求极限 limx趋向无穷(2x+3/2x+1)∧x+1 limx趋向于无穷(cos1/x)^(x)的极限 limx趋近于无穷2x^3-x＋1 极限limx趋向于负无穷,根号下(4X^2+x)*ln(2+1/x)-2ln2*x limx趋向无穷 根号x^2-3/3次根号x^3+1的极限