一个农民想用1000英尺长的篱笆围一块矩形的地（rectangular应该是矩形）.如果这块地一边紧靠着小溪,不需要篱笆,请用自变量为宽度的函数表示出地的面积.
s=y*(1000-2y)
A farmer wishes to fence off a rectangular field with 1000 f
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