设a,b为常数,且x趋于正无穷时(ax^2+bx+1)^(1/2)-x的极限为1,则a+b等于多少
人气:118 ℃ 时间:2020-03-27 11:45:53
解答
√(ax^2+bx+1)-x=[√(ax^2+bx+1)-x]*[√(ax^2+bx+1)+x]/[√(ax^2+bx+1)+x] =[(a-1)x^2+bx+1]/[√(ax^2+bx+1)+x](上下同除x) =[(a-1)x+b+1/x]/[√(a+b/x+1/x^2)+1]上式分母在x→无穷大时,为有限值...
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