现定义运算“★”,对于任意实数a,b,都有a★b=a2-3a+b,如:3★5=32-3×3+5,若x★2=6,则实数x的值是( )
A.-1 | B.4 | C.-1或4 | D.1或-4 |
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现定义运算“★”,对于任意实数a,b,都有a★b=a2-3a+b,如:3★5=32-3×3+5,若x★2=6,则实数x的值是( )
A.-1 | B.4 | C.-1或4 | D.1或-4 |
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