✨ Best Answer ✨
(x+y+z)²＝x²+y²+z²+2xy+2yz+2zx
にあてはめて、
2²＝x²+y²+z²+2(xy+yz+zx)
→ 4＝x²+y²+z²+2
→ x²+y²+z²＝2
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✨ Best Answer ✨
(x+y+z)²＝x²+y²+z²+2xy+2yz+2zx
にあてはめて、
2²＝x²+y²+z²+2(xy+yz+zx)
→ 4＝x²+y²+z²+2
→ x²+y²+z²＝2
Users viewing this question
are also looking at these questions 😉
