你不是算出来了吗😂？极限就是零
(1)lim(x→0)[(e^x)-(e^-x)]/x
=lim(x→0)[(e^x)+(e^-x)]/1=2
(2)lim(x→π/2)cosx/(x-π/2)
=lim(x→π/2)-sinx/1 = -1
(3)lim(x→2)(√x+7)-3/x-2
=lim(x→2)((1/2)√x+7)^(-1/2)/1 = 1/6
(4)lim(x→0)sin3x/tan2x
=lim(x→0)3cos3x/2(sec2x)^2 = 3/2
(5)lim（x→+∞）(lnx)^2/x
=lim（x→+∞）2(lnx)(1/x)/1
=lim（x→+∞）2(lnx)/x
=lim（x→+∞）2/x = 0
(6)lim(z→+∞)(x^2)(e^-3x)
=lim(z→+∞)(x^2)/(e^3x)
=lim(z→+∞)2x/3(e^3x)
=lim(z→+∞)2/9(e^3x)
=0
=lim(1/x)/(2x)=lim1/(2x^2)=0
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