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> 已知,化简二次根式的正确结果为()A.B.C.D.-九年级数学
已知,化简二次根式的正确结果为()A.B.C.D.-九年级数学
题目简介
已知,化简二次根式的正确结果为()A.B.C.D.-九年级数学
题目详情
已知
,化简二次根式
的正确结果为 ( )
A.
B.
C.
D.
题型:单选题
难度:中档
来源:不详
答案
D
分析:二次根式有意义,y<0,结合已知条件得y<0,化简即可得出最简形式.
解答:解:根据题意,xy>0,
得x和y同号,
又
中,-
≥0,
得y<0,
故x<0,y<0,
所以原式=
=
=
=
故答案选D.
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题目简介
已知,化简二次根式的正确结果为()A.B.C.D.-九年级数学
题目详情
答案
解答:解:根据题意,xy>0,
得x和y同号,
又
得y<0,
故x<0,y<0,
所以原式=
故答案选D.