Mot so bai tap PT Vo ty ( hot - NVB)

C¸c bµi to¸n vÒ pt bpt V« tû
C©u 1. Gi¶i c¸c ph¬ng tr×nh sau:
a)
xxx 2114
−=−−+
( x = 0)
b) 2(x
2
-2x) +
0932
2
=−−−
xx

(1
5
±
)
c)
211
22
=−++−−
xxxx
(x = 1)
d)
)121(11

22
xxx
−+=−+
( x= 1; x=1/2)
e) (4x - 1 )
12814
22
++=+
xxx
(VN)
f)
513413

2
−+−=+
xxx

g) x
3
+ 2 = 3
3
23
−
x
( x=1; x = -2 )

h)
1111
22
=++++−+−+
xxxxxx
( PP hµm sè xÐt f(x) =
xxxx
++−+
1
2
)
i)

123
22
=−+−+−
xxxx
(x= 1+-v5)/2)
j)
253294123
2
+−+−=−+−
xxxxx
(x= 2)
k)

112
3
−−=−
xx
( x = 1; 2; 10)
o)
)0(77
28
94
2
>+=
+

xxx
x
( x = (v50-3)/7)
p) ) x
3
+ 1 = 2
3
12
−
x
(x = (-1
5

±
)/2)
q) x
30)35(35
3 33 3
=−+−
xxx
(x = (3
5
±
)/2)
l) (

0)(log)11
2
2
=−++−
xxxx
(QG KD 99)
m)
1221221
=−−−−−+−
xxxx
n) (x+5)(2-x)= 3
xx 3

2
+
s)
33
2
+−
xx
+
63
2
+−
xx

= 3
t)
2
221)2)(1( xxxx
−+=−+