limx趋向于无穷2x^2-4/3x^2-x

limx趋向于无穷x^2+2x-4/x^3-x^2 limx趋向于无穷2x^2-4/3x^2-x limx趋向于无穷时4x^3-2x+8/3x^2+1 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) 极限limx趋向于负无穷,根号下(4X^2+x)*ln(2+1/x)-2ln2*x limx趋向于无穷x²-1/2x²-x-1求极限 求极限limx(sqrt(x^2+100)+x) x趋向于负无穷 求极限 limx趋向无穷(2x+3/2x+1)∧x+1 求极限limx(π/2-arctanx)x趋向正无穷 limx趋近于无穷2x^3-x＋1 limx趋向于正无穷,根号x+1减根号x除以根号x+2减根号x