1/7 jj
sharleane
1 是一个图形,有个圆形内有两条弦互相平行,且长度相等,求圆形内的这两条弦所围成的面积是多少?弦的长度是根号2,这两条弦的中点连成一条线,长度也是根号2。
2 一个书店卖新书和二手书。新书一本卖13元,旧书一本卖5元,有一个学生共买了67元。书店卖一本新书的利润是成本的30%,旧书的利润是100%,求书店卖给这个学生赚得的利润是多少?
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