-b+
| ||
2a |
-b-
| ||
2a |
b |
a |
c |
a |
1 |
x1 |
1 |
x2 |
4 |
3 |
5 |
3 |
1 |
x1 |
1 |
x2 |
x1+x2 |
x1x2 |
-
| ||
-
|
4 |
5 |
16 |
9 |
10 |
3 |
46 |
9 |
A.方程两根和是1 |
B.方程两根积是2 |
C.方程两根和是-1 |
D.方程两根积是两根和的2倍 |
A.-1 | B.1 |
C.5 | D.以上三个中的任何一个 |
A.m2+6m+6m+7=0 | B.m2-6m-7=0 |
C.m2+6m-7=0 | D.m2-6m+7=0 |
A.x1+x2=2 | B.x1+x2=-4 | C.x1x2=-2 | D.x1x2=4 |
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