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Mathematics, 16.06.2021 09:40 imran2k13

Cho hàm số f(x, y)= \frac{2x^{2}+y^{2} }{3xy} a/ tính vi phân cấp 1 của hàm số tại (1,1)
b/ tính các đạo hàm riêng cấp 2 của hàm số tại (1,1)
c/ chứng minh rằng không tồn tại lim(x, y)->(0,0) f(x, y)
giúp mình nha

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Cho hàm số f(x, y)= a/ tính vi phân cấp 1 của hàm số tại (1,1)
b/ tính các đạo hàm riêng cấp...
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