已知5x-1/5

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已知5x-1/5已知5x-1/5已知5x-1/55x-1/55x-5yx-y所以xy''=2/3*(x+1)^(2/3-1)(x-5)^2+(x+1)^(2/3)*2(x-5)=2/3*(x+1)^(-

已知5x-1/5
已知5x-1/5

已知5x-1/5
5x-1/5<-1+5y
5x-5y<-4/5
x-y<-4/25<0
所以x

y'=2/3*(x+1)^(2/3-1)(x-5)^2+(x+1)^(2/3)*2(x-5)
=2/3*(x+1)^(-1/3)(x-5)^2+2(x+1)^(2/3)*(x-5)
=2/3*(x+1)^(-1/3)(x²-10x+25+3x²-12x-15)
=(8x²-44x+20)/[3(x+1)^(1/3)]