Mathematics
Senior High
236の(１)と(3)教えて頂きたいです
*(2) (a² +46°)
236 *(1) a+b=10&_a² + b²+1=2(a+b=ab)
*(2) a+b+c=0
(a+b)(b+c)(c+a)+abc=0
(3) 3x+y=3z, x+z=3y = x² + y²=z²
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