Tính các giới hạn sau: b) lim x đến 1 x^3+ x^2 +x-3/ x^3-1;
Giải thích
b, limx→1x3+x2+x−3x3−1=limx→1x3−1+x2−1+x−1x−1x2+x+1
=limx→1x−1x2+x+1+x+1+1x−1x2+x+1=limx→1x2+2x+3x2+x+1=1+2+31+1+1=2
b, limx→1x3+x2+x−3x3−1=limx→1x3−1+x2−1+x−1x−1x2+x+1
=limx→1x−1x2+x+1+x+1+1x−1x2+x+1=limx→1x2+2x+3x2+x+1=1+2+31+1+1=2