A.2x-2 B.2y+4 C.2x+2y+2 D.2y+4+x2-2x

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问题 A.2x-2B.2y+4C.2x+2y+2D.2y+4+x2-2x

选项 A.2x-2
B.2y+4
C.2x+2y+2
D.2y+4+x2-2x

答案 B

解析 z=x2+y2-2x+4y+5,
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