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(2006•山西)已知a,b是方程x2-2x-1=0的两个根,则a2+a+3b的值是A.7...
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(2006•山西)已知a,b是方程x
2-2x-1=0的两个根,则a
2+a+3b的值是( )
A.7
B.-5
C.7
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
D.-2
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(2006•山西)已知a,b是方程x2-2x-1=0的两个根,则a2+a+3b的值是( )
A.7
B.-5
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(2006•山西)已知a,b是方程x2-2x-1=0的两个根,则a2+a+3b的值是( )
A.7
B.-5
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A.7
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A.7
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A.7
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(2006•威海)已知a,b为一元二次方程x2+2x-9=0的两个根,那么a2+a-b的值为( )
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C.7
D.11
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(2006•凉山州)已知:x2+a2x+b=0的两个实数根为x1、x2;y1、y2是方程y2+5ay+7=0的两个实数根,且x1-y1=x2-y2=2.求a、b的值.