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若a2=9, =-2,则a+b=( ) A. -5 B. -11 C. -5 或 -11 D. [Failed to download image : http://qbm-images.oss-cn...
题目内容：
若a2=9, 
=-2,则a+b=( )
A. -5 B. -11 C. -5 或 -11 D. [Failed to download image : http://qbm-images.oss-cn-hangzhou.aliyuncs.com/QBM/2018/4/13/1923307707498496/1924745231712256/STEM/88648fe9667844b88a7b7a150b27acfe.png]5或[Failed to download image : http://qbm-images.oss-cn-hangzhou.aliyuncs.com/QBM/2018/4/13/1923307707498496/1924745231712256/STEM/88648fe9667844b88a7b7a150b27acfe.png]11
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