((7/(3x+1))^(1/(x-2)^(1/2))当X趋于2的极限

问题描述:

((7/(3x+1))^(1/(x-2)^(1/2))当X趋于2的极限

你好!取对数得ln[7/(3x+1)] / √(x-2) = [ ln7 - ln(3x+1) ] / √(x-2)令u=√(x-2) →0x = u²+2[ ln7 - ln(3u²+7) ] / u洛必达法则 - 6u / 3u²+7 = 0所以原式 = e^0 = 1