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将函数y=x2+x+b的图象向右平移a(a>0)个单位,再向上平移2个单位,得到...
将函数y=x2+x+b的图象向右平移a(a>0)个单位,再向上平移2个单位,得到函数y=x2-3x+4的图象,则a、b的值分别为( )
A.a=1、b=4
B.a=2、b=2
C.a=2、b=0
D.a=3、b=2
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