lim(x→1)3x^2-3/3x^2-2x-1怎么解呢
问题描述:
lim(x→1)3x^2-3/3x^2-2x-1怎么解呢
答
lim(x→1)(3x^2-3)/(3x^2-2x-1)
=lim(x→1) [3(x-1)(x+1)]/[(3x+1)(x-1)]
=lim(x→1) 3(x+1)/(3x+1)
=3(1+1)/(3×1+1)
=3/2
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