Tính lim(x->1) ( căn bậc 3 (x+7) - căn bậc 2(x^2 +x+2))/(x-1)

Đáp án D

limx→1x+73−x2+x+2x−1=limx→1x+73−2x−1−limx→1x2+x+2−2x−1

=limx→11x+723+2x+73+4−limx→1x+2x2+x+2+2=112−34=−23