1 |
p |
1 |
q |
1 |
p |
1 |
q |
p+q |
pq |
m |
1 |
1 |
p |
1 |
q |
1 |
P |
1 |
q |
p+q |
pq |
-m |
1 |
1 |
p |
1 |
q |
x1 |
x2 |
x2 |
x1 |
3 |
2 |
A.-6 | B.6 | C.-5 | D.5 |
A.方程2y2-y+
| ||
B.方程x2+x+1=0的两个实数根之积为-1 | ||
C.以-1、2两数为根的一元二次方程可记为:x2+x-2=0 | ||
D.一元二次方程2x2+4x+3m=0的两实数根的平方和为7,则m=-1 |
-b+
| ||
2a |
-b-
| ||
2a |
-2b |
2a |
b |
a |
b2-(b2-4ac) |
4a2 |
c |
a |
b |
a |
c |
a |
x | 21 |
x | 22 |
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