\(x^4+2x^3-3x^2-8x-4=0\Leftrightarrow x^3\left(x+2\right)-3x\left(x+2\right)-2\left(x+2\right)=0\Leftrightarrow\left(x+2\right)\left(x^3-3x-2\right)=0\)
\(\Leftrightarrow\left(x+2\right)\left(x^3-2x^2+2x^2-4x+x-2\right)=0\)(chỗ này bạn tự tách tiếp)
\(\Leftrightarrow\left(x-2\right)\left(x+2\right)\left(x+1\right)^2=0\Rightarrow\)hoặc x=2 hoặc x= -2 hoặc x=-1
1).(4-3x)(10-5x)=0 2).(7-2x)(4+8x)=0 3).(9-7x)(11-3x)=0
4).(7-14x)(x-2)=0 5).(\(\dfrac{7}{8}\)-2x)(3x+\(\dfrac{1}{3}\))=0 6).3x-2x\(^2\)
7).5x+10x\(^2\)
tìm x biết
a/x^3+3x^2+3x+2=0
b/x^4-2x^3+2x-1=0
c/x^4-3x^3-6x^2+8x=0
giải phương trình sau đặt biến phụ
1) 2x^3+7x^2+7x+2=0
2) x^3-8x^2-8x+1=0
3) x^5+2x^4+4x^2-3x+1=0
4) x^4+x^3+x^2+x+1=0
tìm x: a)x^4-2x^3+5x^2-10x=0
b)(3x+5)^2=(2x-2)^2
. c)x^3–2x^2+x=0
. d)x^2(x-1)-4x^2+8x-4=0
1) (4-3x) (10x-5)=0
2) (7-2x) (4+8x) = 0
3) (9-7x) (11-3x) = 0
4) (7-14x) (x-2) = 0
5) (2x+1) (x-3) = 0
6) (8-3x) (-3x+5) = 0
7) (16-8x) (2-6x) = 0
8) (x+4) (6x-12) = 0
9) (11-33x) (x+11) = 0
10) (x-1/4) (x+5/6) = 0
11) (7/8-2x) (3x+1/3) = 0
12) 3x - 2x^2 = 0
13) 5x + 10x^2 = 0
14) 4x + 3x^2 = 0
15) -8x^2 + x =0
16) 10x^2 - 15x = 0
17) x^2 -4 =0
18) 9 - x^2 = 0
19) x^2 -1 = 0
20) (x-3) (2x-1) = (2x-1) ( 2x+3)
21) (5+4x) (-x+2) = (5+4x) (7+5x)
22) (4+x) (x-5) = (3x-8) (x-5) = 0
23) (3x-8) (7-21x) - (9+2x) (7-21x)
24) (10+ 7x) (x+1) = (9x-2)(x-1)
25) (9x-4) (x-1/2) - (x-1/2) (6+x) = 0
26) 9x^2 - 1 = (3x-1) (x+4)
27) (x+7) (3x+1) = 49-x^2
28) (2x+1)^2 = (x-1)^2
29)x^3- 5x^2+6x = 0
30) 3x^2 + 5x + 2 = 0
Giảii giúpp mìnhh đyy mọii ngườii .
Giải phương trình
1)(x-2)(x-1)=x(2x+1)+2
2)(x+2)(x+2)-(x-2)(x-2)=8x
3)(2x-1)(x^3-x+1)=2x^3-3x^2+16=0
4)(8x-3)(3x+2)-(4x+7)(x+4)=(2x+1)(5x-1)
5)(8-5x)(x+2)+4(x-2)(x+1)+2(x-2)(x+2)=0
6)4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
a) (x + 2)(x + 3)- (x- 2)(x + 5) = 0;
b) (2x + 3)(x - 4) + (x- 5)(x- 2) = (3x- 5)(x- 4);
c) (8- 5x)(x + 2) + 4(x- 2)(x + I ) + 2(x- 2)(x + 2) = 0;
d) (8x- 3)(3x + 2)- (4x + 7)(x + 4) = (2x + 1)(5x- I)- 33.
a,2x^3 + 5x^2 +2x-9=0
b,x^4-4x^3+3x^2+8x-10=0
