A、<img src="http://admintk.100xuexi.com/UpLoadImage/2016-08-18/6aca07f6-02ab-44e0-8b5a-c0ceddbc0c08.jpg" title="1.jpg" />-y″-y′+y=0
B、<img src="http://admintk.100xuexi.com/UpLoadImage/2016-08-18/51ffb554-e59f-4867-8cfd-ca2f45bfd715.jpg" title="1.jpg" />+y″-y′-y=0
C、<img src="http://admintk.100xuexi.com/UpLoadImage/2016-08-18/c644ec5b-5725-46f2-8c2a-5169e4800315.jpg" title="1.jpg" />-6y″+11y′-6y=0
D、<img src="http://admintk.100xuexi.com/UpLoadImage/2016-08-18/cc8e4a36-cedb-4eaf-ac9c-f9a13f99e202.jpg" title="1.jpg" />-2y″-y′+2y=0
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