题目：
设函数f（x）=（2a-1）x+b在R上是减函数，则a的范围是（ ）。
答案：
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Madame Curie I like Madame Curie best. Madame Curie was a world famous woman scientist. She was born in Poland in 1867 and died in 1934. When she was a child, she lo...
