A.x1=2,x2=2 | B.x1=8,x2=-4 | C.x1=-8,x2=2 | D.x1=8,x2=-2 |
-6±
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2 |
-6±10 |
2 |
A.(x+3)2=-2 | B.(x+3)2=2 | C.(x-3)2=2 | D.(x-3)2=-2 |
A.方程x2=1的根为x1=1,x2=-1 | ||||
B.方程x2=0的根为x1=x2=0 | ||||
C.方程(x-2)2=4的根为x1=4,x2=-4 | ||||
D.方程3x2-6=0的根为x1=
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A.x=1 | B.x=-1 | C.x1=1,x2=-1 | D.x=2 |
1 |
a2 |
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