求下面的极限值
展开全部
(1)
lim(x->3)(3x^4+2^2-x+1)
=243+4-3+1
=245
(2)
lim(u->-2)√(u^4+3u+6)
=√(16-6+6)
=4
(3)
lim(t->2) [(t^2-2)/(t^3-3t+5) ]^2
= [(4-2)/(8-6+5) ]^2
=(2/7)^2
=4/49
(4)
lim(x->2)(x^2+x-6)/(x-2)
=lim(x->2)(x-2)(x+3)/(x-2)
=lim(x->2)(x+3)
=5
(5)
lim(h->0) [√(9+h) -3]/h
=lim(h->0) 1/[√(9+h) +3]
=1/(3+3)
=1/6
lim(x->3)(3x^4+2^2-x+1)
=243+4-3+1
=245
(2)
lim(u->-2)√(u^4+3u+6)
=√(16-6+6)
=4
(3)
lim(t->2) [(t^2-2)/(t^3-3t+5) ]^2
= [(4-2)/(8-6+5) ]^2
=(2/7)^2
=4/49
(4)
lim(x->2)(x^2+x-6)/(x-2)
=lim(x->2)(x-2)(x+3)/(x-2)
=lim(x->2)(x+3)
=5
(5)
lim(h->0) [√(9+h) -3]/h
=lim(h->0) 1/[√(9+h) +3]
=1/(3+3)
=1/6
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