@ @QPU@ @pý†bɾa@ @
−1 ± 1 7 ( ) 1±1 7 ()
22 22
−1 ± 7 ( ) 1± 7 ( )
x 2 + 4x + m = 0 m ()
1 () 1( ) 5( ) 4 ()
5 4
α a≠0
ax2 − 6x + a − 2 = 0 ()
a = 4 a = −2 ( ) a 2α )
a = −4 a = 2 ( )
a = 4 a =2 ()
12 a = −4 a = −2 ( )
(
.
12
0.2
.
2 ( ) 11 ( ) 1 ( ) 1()
2 2
()
8 . 1600