一个长方形的地的周长是250米.如果一边的长是40米,那么这块地的面积是多大?答案用方米.
Naomi 做银饰.为了做一套耳环,她从一块银碟上切出银块,如图.切出的块从银碟的中心是40°.如果每一块没有切出的银碟平均2.5克,那么每块切出来的银块有多重?
楼上的你的翻译把题复杂化了.
The perimeter of a rectangular plot of land is 250 meterr.If
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