∵z=y/√(x²+y²)
∴dz=d(y/√(x²+y²))
=[√(x²+y²)dy-yd(√(x²+y²))]/[√(x²+y²)]²
=[√(x²+y²)dy-y(xdx+ydy)/√(x²+y²)]/[√(x²+y²)]²
=[x(xdy-ydx)]/[√(x²+y²)]³.
Z=y/根號下X平方+Y平方的全微分
Z=y/根號下X平方+Y平方的全微分
數(shù)學(xué)人氣:974 ℃時間:2020-04-13 05:46:44
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