A. 5X3 + 5 = 0A. (2X 5 2X 7+ ) ( − −) (2X 3− )2 =36B. 2(X + 5) – X2 –...
4. Tìm x:
a. 5x
3
+ 5 = 0
a.
(
2x 5 2x 7
+
) (
− −
) (
2x 3
−
)
2
=
36
b. 2(x + 5) – x
2
– 5x = 0
b.
6
x
(
x
−
1999
)
−
x
+
1999
=
0
c. (2x – 3)
2
– (x + 5)
2
= 0
c.
x
2
−
9
−
4
(
x
+
3
)
=
0
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