高中数学代数与函数一其他练习题3
题目内容

已知xy<0且x+y=2,而http://picflow.koolearn.com/upload/papers/g02/20110322/20110322135902961955.gif按x的降幂排列的展开式中,第三项不大于第四项,那么x的取值范围是

2021-07-12

A.http://picflow.koolearn.com/upload/papers/g02/20110322/201103221401316641163.gif

B.http://picflow.koolearn.com/upload/papers/g02/20110322/201103221401364301035.gif

C.(-∞,0)

D.http://picflow.koolearn.com/upload/papers/g02/20110322/201103221401419451025.gif

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