x+y+z = 3/4
6(x²+y²+z²) + 10(xy+yz+zx)
(x+y+z)² = x²+y²+z²+(xy+yz+zx)
(x+y+z)² - 2(xy+yz+zx) = x²+y²+z²
6[(x+y+z)²-2(xy+yz+zx)] + 10(xy+yz+zx)
6(3/4)²-2(xy+yz+zx)
6(9/16)-2(xy+yz+zx)
27/8-2(xy+yz+zx)
em k hiểu ạ
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x+y+z = 3/4
6(x²+y²+z²) + 10(xy+yz+zx)
(x+y+z)² = x²+y²+z²+(xy+yz+zx)
(x+y+z)² - 2(xy+yz+zx) = x²+y²+z²
6[(x+y+z)²-2(xy+yz+zx)] + 10(xy+yz+zx)
6(3/4)²-2(xy+yz+zx)
6(9/16)-2(xy+yz+zx)
27/8-2(xy+yz+zx)
em k hiểu ạ