作业帮lim→1(x³-2x+1)/(x²-1)
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lim→1(x³-2x+1)/(x²-1)
lim→1(x³-2x+1)/(x²-1)
lim→1(x³-2x+1)/(x²-1)
(x^3-2x+1)/(x^2-1)
=[x(x^2-1)-(x-1)]/(x^2-1)
=x-(1/(x+1)
lim->1 = 1-1/2=1/2
