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把抛物线y=x2+bx+c的图象向右平移3个单位,再向下平移2个单位,所得图象的...
把抛物线y=x2+bx+c的图象向右平移3个单位,再向下平移2个单位,所得图象的解析式为y=x2-3x+5,则( )
A.b=3,c=7
B.b=6,c=3
C.b=-9,c=-5
D.b=-9,c=21
考点分析:
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