5X−1 =52 B/LOG( X+15) +LOG 2( X− =5) 2C/(2− 3) (X + +2 3)X =14 D/LOG2 X + LOG3 X + LOG4 X = LOG20 X
Câu 3(4 điểm):Giải phương trình :
a/
5x
+
1
+6.5x
−3.5x
−
1
=52b/
log
(
x
+
15
)
+
log 2
(
x
− =
5
)
2
c/
(
2
−
3
) (
x
+ +
2
3
)
x
=
14
d/
log
2
x + log
3
x + log
4
x = log
20
x
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