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x²+7x-18
かけて-18、足して7になるふたつの数字は
1×-18=-18、1-18=-17❌
-1×18=-18、-1+18=17❌
2×-9=-18、2-9=-7❌
-2×9=-18、-2+9=7⭕

(x-2)(x+9)

キッド

解説ありがとうございます

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