Tìm lim 2n - căn (4n^2+n) / n + căn n^2-2n
Giải thích
lim 2n−4n2+n=lim2n−4n2+n2n+4n2+n2n+4n2+n=lim−n2n+4n2+n
= lim−12+4+1n=14
limn−n2−2n=limn−n2−2nn+n2−2nn+n2−2n=limn2−n2+2nn+n2−2n
=lim21+1−2n=1
Suy ra: lim2n−4n2+nn+n2−2n=−14.
lim 2n−4n2+n=lim2n−4n2+n2n+4n2+n2n+4n2+n=lim−n2n+4n2+n
= lim−12+4+1n=14
limn−n2−2n=limn−n2−2nn+n2−2nn+n2−2n=limn2−n2+2nn+n2−2n
=lim21+1−2n=1
Suy ra: lim2n−4n2+nn+n2−2n=−14.