b2-4ac
(-3)2-4x1x(-2)
9+8
17
-b+-b2-4ac/2a
3
CBDCACADCDDAACC
BDCACCBCAADBDBB
124
伯贤我喜欢你
coop
Cbdca. Cadcddaacc
a不等于0时 a的0次幂等于1
Bdcaccbcadbdbb
1.(b+c)^2=4(b+c-1)
so b+c=2
a+b>c
(a-b)2-c2
3*3*3*2=9*6=54
3*2*2*2=6*4=24
54+24=78
m2=m+1
m4=(m+1)2
m3=(m+1)m
m2+2m+1-m2-m-m+2
x3y-xy3
=xy(x-y)(x+y)
=1*2/2*
/2005*2007
2007/15=14
1002.5
1003.5 2006
3a2b+3ab2
=3ab(a+b)
2 48-1
王晨