-b±
| ||
2a |
-1±
| ||
2×1 |
-1+
| ||
2 |
-1-
| ||
2 |
A.y-3=0,5y-1=0 | B.5y=0,y-3=0 |
C.5y+1=0,y-3=0 | D.5y=1,y-3=3-y |
A.-4 | B.-3 | C.3 | D.2 |
A.有两个不相等的实数根 | B.有两个相等的实数根 |
C.只有一个实数根 | D.没有实数根 |
A.(x-2)2=7 | B.(x-2)2=1 | C.(x+2)2=1 | D.(x+2)2=2 |
A.±4 | B.±6 | C.-4或6 | D.4或-6 |
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