(x-8)(200-40(x-10))=720

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(x-8)(200-40(x-10))=720(x-8)(200-40(x-10))=720(x-8)(200-40(x-10))=720回家自己算去尼玛

(x-8)(200-40(x-10))=720
(x-8)(200-40(x-10))=720

(x-8)(200-40(x-10))=720
回家自己算去 尼玛