A.a=-1,b=2 B.a=-1,b=-2 C.a=-1,b=-1 D.a=1,b=1C

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问题

选项 A.a=-1,b=2B.a=-1,b=-2C.a=-1,b=-1D.a=1,b=1

答案C

解析[img]/upload/tiku/212/2835486_1.jpg[/img][img]/upload/tiku/212/2835486_1_1.jpg[/img]
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