lim (√(x^2+1)+2x)^2/(3x^2+1) x→＋∞

lim(1-x)^(2/x) x->0 lim(x趋向无穷)-(x+1)+√(x^2+1) lim x-无穷 (√3x^2+1)/x+1 求lim(√x^2+1)-x x→-∞ lim(x趋于0) (√(x^2+1)-1)/x,lim(x->0) (√(x^2+1)-1)/x 1、lim(x->无穷大) e^x arctanx2、lim(x->0)sinx√1+sin(1/x)3、lim(x->无穷大)【（√x^2+x+1）-【(√x^2-x+1)】4、lim(x->无穷大)((x+{x+(x)^0.5]^0.5}^0.5)/(2x+1)^0.55、lim(x->0)(sin3x+x^2sin1/x)/((1+cosx)x)6、lim(n->无穷大)(2^n)(si lim(x(sin)^2) 极限：lim(x->2)1/(x-2) lim(1-(5/x))^x-2 lim(x+e^2x)^(1/sinx) lim((√1+x^2)+x)/((√x^3+x)-x)x→+无穷大 1.lim x→0 3x/(sinx-x)2.lim x→0 (1-cosmx)/x^23.lim x→0 sin4x/[(√x+2)-√2]4.lim h →0 [sin(x+h)-sin(x-h)]/h lim(x^2+1/x^2-2x)^x=? 1.lim[(1+x)/(2+x)]^(1-√x/1-x)(x--->0+)2.lim[(x+2)/(2x-1)^(x^2)(x--->0) lim(x->无穷大){(2^x-3^x)/2}^(1/x) Lim [x^2/(x^2-1)]^x (x→∞) Lim(x>1) x-1/x^2+x-2.计算 lim x→1 x-1/x^2-x