A、1+x<sup>2</sup>=Cy
B、(1+x<sup>2</sup>)(3+2y)=C
C、(3+2y)<sup>2</sup>=<img width="38" height="38" id="图片 567" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/3d84245a-61e1-4bad-ac7d-9800fcc98ab2.jpg" />
D、(1+x<sup>2</sup>)<sup>2</sup>(3+2y)=0
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