Ngày tải lên :
18/06/2013, 01:25
... 3
3, 5 8 4 4, 7 6
5, 9 6 16 6, 4 13 9 18
7, 4 8 8 8, 6 6 1
x x x x x
x x x x x
x x x x x x
x x x x x x
+ +
+ + + +
+ + +
+ + +
3 2 3
3 3 2
3 2 3 2
3 3
9, 6 4 86 81 10, 7 6
11, 3 2 12, ... có:
)().1( 263
232
xQxaxaxxa
+=+
.
Vỡ ng thc ỳng vi mi x nờn cho x = -1 ta dc:
=
=
=++=++
3
2
060 263
22
a
a
aaaaa
Vi a = -2 thỡ
4104)(, 466 4
223
+=+=
xxxQxxxA
Vi a = 3 thỡ
69 )( ,66 99
223
=+=
xxQxxxA
*Phơng ... b)12-6x=0
c)5x-2=0 d)-2x+14=0
e)0.25x+1,5=0 f )6, 36- 5,3x=0
g)
4 5 1
3 6 2
x − =
h)
5 2
1 10
9 3
x x
−
+ = −
i)11-2x=x-1 k)5-3x=6x+7
l)2(x+1)=3+2x m)2(1-1,5x)+3x=0
n)2,3x-2(0,7+2x)=3 ,6- 1,7x o)3 ,6- 0,5(2x+1)=x-0,25(2-4x)
p)3(2,2-03x)=2 ,6+ (0,1x-4)...