a
,
a
=
x
y
=
2.4
=
8
b
,
x
=
8
y
c
,
y
=
−
1
⇔
x
=
8
−
1
=
−
8
y
=
2
⇔
x
=
8
2
=
4
=
(
35
+
1
6
)
⋅
−
5
4
−
(
45
+
1
6
)
⋅
−
5
4
=
−
10
⋅
−
5
4
=
50
4
=
25
2
B.Hinh thang
Tickk hộ làm nv ạ:((![]()