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①x^2+(x+1)^2+(x+2)^2=245
②(x-1)^2+x^2+(x+1)^2=245


②の式を使います。
3x^2=245-2
x^2=81
x=±9
xは正の整数なので、x=9
よって、求める3つの整数は
8,9,10

ゆめ

有難う御座います!

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