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正确答案：
according to the question, we know that the perimeter of the rectangular is "30"
and the are is "54"
Therefore, we can set the longer side of the are equal to x and the short side is y
Then xy=54 and 2(x+y)=30
we can get that x=9 or 6 and y=6 or 9
Hence, we know that the lnoger side is 9!
>>B
