Mathematics, 18.06.2021 16:20 jlluminate91671

Nhiệt độ tại điểm (x, y) trên một tấm kim loại phẳng được cho bởi T(x, y)=60/(1+x²+y²), trong đó T là nhiệt đo theo °C và x, y theo mét. Tìm tốc độ biến thiên nhiệt độ theo khoảng cách tại điểm (2,1) theo hướng -x và theo hướng -y.

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Nhiệt độ tại điểm (x, y) trên một tấm kim loại phẳng được cho bởi T(x, y)=60/(1+x²+y²), trong đó T l...

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