设z=(x+2y)x,则在点(1,0)处的全微分dz|(1,0)=______.

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问题 设z=(x+2y)x,则在点(1,0)处的全微分dz|(1,0)=______.

选项

答案dx+2dy

解析  ∵dz=
dz=(设z=μν,μ=x+2y,ν=x)
=(νμν-1.1+μνlnμ.1)dx+(νμν-1.2+μνlnμ.0)dy
=[x(x+2y)x-1+(x+2y)xln(x+2y)]dx+2x(x+2y)x-1dy,
∴dz|(1,0)=dx+2dy.
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