问题 选择题 (文)limn→∞n2+2n-1n2-n-1=( )A.1B.-13C.-1D.-712 答案 limn→∞n2+2n-1n2-n-1=limn→∞1+2n-1n21 -1n-1n2=1+0-01-0-0=1,故选A.