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Toán Lớp 8: Cho `3` số `a, b, c` thoả mãn `ab+bc+ca=2019`. CMR: `(a^2-bc)/(a^2+2019)+(b^2-ca)/(b^2+2019)+(c^2-ab)/(c^2=2019)=0`

Home/ Toán Lớp 8: Cho `3` số `a, b, c` thoả mãn `ab+bc+ca=2019`. CMR: `(a^2-bc)/(a^2+2019)+(b^2-ca)/(b^2+2019)+(c^2-ab)/(c^2=2019)=0`

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