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(4)原式=lim(x->1) (x+4)(x-1)/x(x-1)
=lim(x->1) (x+4)/x
=5
(5)原式=lim(x->1) (5x-4-x)/(x-1)[√(5x-4)+√x]
=lim(x->1) 4/[√(5x-4)+√x]
=2
(6)原式=lim(x->∞) (1-1/x+2/x^2)/(1/x^2-1)
=(1-0+0)/(0-1)
=-1
(7)原式=lim(x->0) (4x^2-2x+1)/(3x+2)
=1/2
(8)原式=2+0-0
=2
=lim(x->1) (x+4)/x
=5
(5)原式=lim(x->1) (5x-4-x)/(x-1)[√(5x-4)+√x]
=lim(x->1) 4/[√(5x-4)+√x]
=2
(6)原式=lim(x->∞) (1-1/x+2/x^2)/(1/x^2-1)
=(1-0+0)/(0-1)
=-1
(7)原式=lim(x->0) (4x^2-2x+1)/(3x+2)
=1/2
(8)原式=2+0-0
=2
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