Mathematics, 15.06.2021 17:10 lucky1940

Đưa phương trình sau về dạng chính tắc:
(∂^2 z)/〖∂x〗^2 +2 (∂^2 z)/∂x∂y+(∂^2 z)/〖∂y〗^2 =0

Answers: 1

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Đưa phương trình sau về dạng chính tắc:
(∂^2 z)/〖∂x〗^2 +2 (∂^2 z)/∂x∂y+(∂^2 z)/〖∂y〗^2 =0...