+ =X()15199120032006X + +12007X + + =4038X + + +=2006X15+20062006X4038+2003X2006==X =20192
Câu11:
+
=x
(
)
15
1991
2003
2006
x
+
+
1
2007
x
+
+
=4038
x
+
+
+
=2006
x
15
+
2006
2006
x
4038
+
2003
x
2006
==x
=2019
2
+
=x
(
)
15
1991
2003
2006
x
+
+
1
2007
x
+
+
=4038
x
+
+
+
=2006
x
15
+
2006
2006
x
4038
+
2003
x
2006
==x
=2019
2