1.y=3√x^2的导数是2.y=3√x的导数是
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1.y=3√x^2的导数是2.y=3√x的导数是
1解当x≥0时,y=3√x^2=3x
则y'=(3x)'=3
当x<0时,y=3√x^2=-3x
即y'=(-3x)'=-3
2
y'=(3√x)'
=3(√x)'
=3×1/2√x
=3/(2√x)
再问: 不是3倍根号下x的平方,是3立方根号下x平方
再答: 1y=3√x^2=x^(2/3) 则y'=[x^(2/3)]'=2/3×x^(2/3-1)=2/3×x^(-1/3)=2/[3x^(1/3)] y'=(3√x)'=(x^(1/3))' =1/3×x^(1/3-1) =1/3×x^(-2/3) =1/[3×x^(2/3)] =1/[3x^(2/3)]
则y'=(3x)'=3
当x<0时,y=3√x^2=-3x
即y'=(-3x)'=-3
2
y'=(3√x)'
=3(√x)'
=3×1/2√x
=3/(2√x)
再问: 不是3倍根号下x的平方,是3立方根号下x平方
再答: 1y=3√x^2=x^(2/3) 则y'=[x^(2/3)]'=2/3×x^(2/3-1)=2/3×x^(-1/3)=2/[3x^(1/3)] y'=(3√x)'=(x^(1/3))' =1/3×x^(1/3-1) =1/3×x^(-2/3) =1/[3×x^(2/3)] =1/[3x^(2/3)]