giải các phư
29,4 x 3+ 21 x 2 +21 x +4=0
ơngtrình sau
4
3
2
30,2 x −7 x + 9 x −7 x +2=0
1,6 ( x +3 ) −9 ( x+ 4 )+ 7 ( x +6 )=0
31, x 5 +2 x 4 +3 x3 +3 x 2+ 2 x +1=0
2
2, ( x −6 ) −25=0
3
2
32,2 x −x + 5 x +3=0
2
2
3, ( 4 x−5 ) −9 ( 4 x +5 ) =0
33,24 x3 −26 x2 +20 x=20 x 2−9 x +6
2
4, ( 5 x−6 ) = (3 x +5 ) ( 6−5 x )
5, x 4 + x 3+ x2 + x +1=0
3
3
4
3
2
34,2 x −9 x + 4 x −9 x +2=0
3
6, x + y + ( x + y ) +30 xy =2000
35,6 + 25 x +12 x −25 x +6=0
7 , x 4−x 3 +2 x 2−x +1=0
36,2 x 4 −21 x 3 +74 x 2−105 x +50=0
8, ( x 4−5 x 2−36 ) ( 8−3 x )
37,6 x +7 x −36 x −7 x+ 6=0
¿ ( x 2−9 ) ( x 2 +4 ) ( 2 x +3 )
38, ( x2−x +1 ) + ( x2−2 x +3 ) + …
3
3
5
11,, ( x−1 ) + ( x+3 ) =242 ( x+1 )
12, ( 4−x )5+ ( x −2 )5=32
13, x ( x 2−1 ) ( x+2 ) =24
14, ( x +2 ) ( x+3 )( x−5 )( x−6 )=180
2
15,2 x ( 8 x−1 ) ( 4 x−1 )=9
2
16, ( 2 x +1 )( x +1 ) (2 x +3 )=18
2
17, ( 12 x+ 7 ) (3 x +2 ) ( 2 x +1 )=3
3
3
3
19, ( x−1 )3 + ( 2 x−3 )2 + ( 3 x−5 )
¿ 3 ( x−1 )( 2 x−3 ) ( 3 x−5 )
20, ( x +9 )( x +10 ) ( x+11 )−8 x=0
21, ( x2 +3 x +2 ) ( x2 +7 x +12 )=24
2
22, ( x2 −3 ) +3 ( x−1 )=x ( 2 x−1 )
3
23, ( 2 x 2 +3 ) −10 x 3−15 x=0
24, ( x2 −4 x +11 ) ( x 4 −8 x 2+21 ) =35
25, ( x2 +3 x +2 ) ( x2 +7 x +12 )=2 x 2
26, ( x +2 ) ( x+ 3 )( x +8 )( x +12 )=4 x 2
27, (10 x +14 )4−10 4 ( x +1 )4 =256
4
3
2
3
2
2
+ ( x 2−100 x+ 199 )=0
10, ( x +1 )4 + ( x −3 )4 =82
18, ( x +1 ) + ( x−2 ) = (2 x−1 )
3
4
9, ( x+3 ) −( x−1 ) =56
5
4
28, x −4 x −19 x +106 x=120