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Toán Lớp 7: cho `( ay – bx )/c = ( cx – az) /b = ( bz – cy )/a .` cmr `( ax + by + cz )^2 = ( x^2 + y^2 + z^2 ) ( a^2 . b^2 . c^2 )`

Home/ Toán Lớp 7: cho `( ay – bx )/c = ( cx – az) /b = ( bz – cy )/a .` cmr `( ax + by + cz )^2 = ( x^2 + y^2 + z^2 ) ( a^2 . b^2 . c^2 )`

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