TÍNH ∆− = − − =B V Ì ∆> 0 NÊN X1+X2 = ( )4 43 3A=− − =CX1.X2= ( )2...
Bài 4:(1.5) :Tính
∆
− =
− −
=
b
V ì∆
> 0 nên x1
+x2
= ( )4
4
3
3
a
=
− −
=
c
x1
.x2
= ( )2
2
∆
− =
− −
=
b
V ì∆
> 0 nên x1
+x2
= ( )4
4
3
3
a
=
− −
=
c
x1
.x2
= ( )2
2