1 是一個圖形,有個圓形內有兩條弦互相平行,且長度相等,求圓形內的這兩條弦所圍成的面積是多少?弦的長度是根號2,這兩條弦的中點連成一條線,長度也是根號2。
2 一個書店賣新書和二手書。新書一本賣13元,舊書一本賣5元,有一個學生共買了67元。書店賣一本新書的利潤是成本的30%,舊書的利潤是100%,求店賣給這個學生賺得的利潤是多少?
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