几道简单的数学极限小题
1.lim(x→∞)(2x-cosx)/x
2.lim(n→∞)(1+2+3+…n)/n^2
3.lim(x→+∞)(根号下x+1-根号下x)
4.lim(x→1)(根号下x+2-根号3)/(x-1)
1.2
2.1/2
3.0
4.根号3/6