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解30x-80-(6x-6)*(3x+18)+1 30x-80-(18x^2+108-18x-108)+1 30x-80-18^2-108+18+108+1 30x-18^2-80+19 30x-18^2-61 題目如果不錯,答案就不會錯 18x^2是18(x的平方)
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