大一高数求教。
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证明:
∂z/∂x
=∂[y/f(x²-y²)]/∂x
= - (f'·2xy)/f(x²-y²)²
∂z/轿竖∂y
=∂[y/f(x²-y²)]/∂y
= [f(x²-y²)+2y²f']/f(x²-y²)²
(∂z/∂x)·(1/x)+(∂z/∂y)·(1/y)
= [- 2yf'/f(x²-y²)²] + [f(x²-y²)]/[yf(x²-y²)²] + [2yf'/f(x²闭源大-y²)²]
=1/yf(x²-y²)
=z/y
因此,原裂搭题错误!
∂z/∂x
=∂[y/f(x²-y²)]/∂x
= - (f'·2xy)/f(x²-y²)²
∂z/轿竖∂y
=∂[y/f(x²-y²)]/∂y
= [f(x²-y²)+2y²f']/f(x²-y²)²
(∂z/∂x)·(1/x)+(∂z/∂y)·(1/y)
= [- 2yf'/f(x²-y²)²] + [f(x²-y²)]/[yf(x²-y²)²] + [2yf'/f(x²闭源大-y²)²]
=1/yf(x²-y²)
=z/y
因此,原裂搭题错误!
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