limit 问题
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唔好意思
想问埋83
81 lim(x->∞)_[√(x^2+25)-√(x^2-1)] =lim(x->∞)_{[√(x^2+25)-√(x^2-1)]*[√(x^2+25)+√(x^2-1)] / [√(x^2+25)+√(x^2-1)] =lim(x->∞)_{[(x^2+25)-(x^2-1)]/ [√(x^2+25)+√(x^2-1)] =lim(x->∞)_{26/ [√(x^2+25)+√(x^2-1)] =0 82 lim(x->-∞)_[√(x^2+3)-√(x^2-1)] =lim(x->-∞)_{[√(x^2+3)-√(x^2-1)]*[√(x^2+3)+√(x^2-1)] / [√(x^2+3)+√(x^2-1)] =lim(x->∞)_{[(x^2+3)-(x^2-1)]/ [√(x^2+3)+√(x^2-1)] =lim(x->∞)_{4/ [√(x^2+3)+√(x^2-1)] =0 84 lim(x->∞)_[√(9x^2-4)-3x] =lim(x->∞)_{[√(9x^2-4)-3x]*[√(9x^2-4)+3x]/ [√(9x^2-4)+3x] =lim(x->∞)_{[(9x^2-4)-9x^2]/ [√(9x^2-4)+3x] =lim(x->∞)_{-4/ [√(9x^2-4)+3x] =0
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