a small island has 2/5 of its surface covered by forest and 1/4 of the remainder of its surface by sand dunes.The island
a small island has 2/5 of its surface covered by forest and 1/4 of the remainder of its surface by sand dunes.The island also has 90 hectares covered by farm land if the lsland is made up of only forest.what is the total area of the island.
英語人氣：105 ℃時間：2020-02-05 17:10:34
優(yōu)質(zhì)解答
題樓上已翻譯題目的意思我就直接解了.如果不要方程的話：森林+沙丘：2/5+1/4=13/20那么剩下的就是農(nóng)場：單位“1”-13/20=7/2090公頃=“7/20”:90÷7/20=1800/7公頃（好怪哦、、)=257又1/7公頃答：the total area od ...
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