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Mathematics, 23.06.2021 19:40 Kaylenejohnson00

Cho z=ln(xy+x^2)
chứng minh rằng : z''y^2-z"x^2=1/x^2

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Cho z=ln(xy+x^2)
chứng minh rằng : z''y^2-z"x^2=1/x^2...

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