Tìm x biết:
a) x3 - 7x2 - 9x + 63 = 0
b) x3 - 3x2 + 3x - 1 + 2.(x2 - x) = 0
Tìm x:
1, x2 - 2x +3=0
2, 5x .(x-1) = x-1
3, 2.(x+5) -x2 -5x=0
4, x+5x2 =0
5, x+1=(x+1)2
6, 5x.(4x-5)=(2x-3).(4x-5)
7, (4x2+2x).(x2 -x)+(4x2 +6).(x-x2)=0
8, (x+12)2 - 9x2=0
tìm x biết
a/ x^3-x^2-x+1=0
b/(2x^3-3)^2-(4x^2-9)=0
c/x^4+2x^3-6x-9=0
d/2(x+5)-x^2-5x=0
tìm x biết
a/ x^3-x^2-x+1=0
b/(2x^3-3)^2-(4x^2-9)=0
c/x^4+2x^3-6x-9=0
d/2(x+5)-x^2-5x=0
Phân tích thành nhân tử :
a. x^2 - 4x - 5 = 0
b. 2x^2 - 6x + 4 = 0
c. 5x^2 - x - 18 = 0
d. 2x^3 - 3x^2 + x + 30
đ. 5x^3 - 21x^2 + 11x + 5
bài 1: phân tích thành nhân tử
a) \(^{6x^2}\)+ 9x b) \(4x^2\) + 8x c) \(5x^2\) + 10x
d) \(2x^2\)- 8x e) 5x - 15y f) x (\(x^2\)-1) + 3 (\(x^2\)-1)
g) \(x^2\)- 2x + 1 - \(4y^2\) h) \(x^2\)- 100 i) \(9x^2\)- 18x + 9
k) \(x^3\) - 8 l) \(x^2\)+ \(6xy^2\) + \(9y^4\) m) 4xy - \(4x^2\) - \(y^2\)
n) \(\left(x-15\right)^2\) - 16 o) 25 - \(\left(3-x\right)^2\) p) \(\left(7x-4\right)^2\)- \(\left(2x+1\right)^2\)
Bài 2: phân tích thành nhân tử
a) \(3x^3\) - \(6x^2\) + 3\(x^2y\) - 6xy b) \(x^2\) - 2x + xy -2y
c) 2x + \(x^2\) -2y - 2xy + \(y^2\) d) \(x^2\) - 2xy + \(y^2\) - 9
e) \(x^2\)+ \(y^2\) - 2xy -4 f) 2xy - \(x^2\)- \(y^2\) + 9
h) \(x^2\)- \(y^2\) + 12y - 36 i) \(4x^2\) - 9 - x(2x - 3)
bài 3: tìm x
a) 2(x + 3) - \(x^2\) -3x = 0 b) \(x^3\) - 25x= 0
c) 5(x-9) + \(x^2\) -9x = 0 d) 2(x + 5) - \(x^2\) -5x = 0
e) (2x + 3)(x - 1) + (2x-3)(1 - x) = 0 f) \(x^3\) + \(x^2\) + x + 1 = 0
h) 2x(x + 3) = x+3 i) \(x^2\)(x - 5) - 4x+ 20 = 0
Phân tích thành nhân tử
A) x^2 +5x-6
B ) 5x^2+5xy-x-y
C) 7x-6x^2-2
D) x^2+4x+3
E) 2x+3x-5
F) 16x-5x^3
Tìm x
A) 5x(x-1)=x-1
B) 2(x+5)-x^2-5x=0
Cho a+b+c=0.Chứng minh a^3+b^3+c^3 = 3abc
Phân tích các đa thức sau thành nhân tử:
1) x3 - 7x + 6
2) x3 - 9x2 + 6x + 16
3) x3 - 6x2 - x + 30
4) 2x3 - x2 + 5x + 3
5) 27x3 - 27x2 + 18x - 4
6) x2 + 2xy + y2 - x - y - 12
7) (x + 2)(x +3)(x + 4)(x + 5) - 24
8) 4x4 - 32x2 + 1
9) 3(x4 + x2 + 1) - (x2 + x + 1)2
10) 64x4 + y4
11) a6 + a4 + a2b2 + b4 - b6
12) x3 + 3xy + y3 - 1
13) 4x4 + 4x3 + 5x2 + 2x + 1
14) x8 + x + 1
15) x8 + 3x4 + 4
16) 3x2 + 22xy + 11x + 37y + 7y2 +10
17) x4 - 8x + 63
bài 1: a)x2+7x+12=0 b)2x2+5x-3=0
c)3x2+10x+7=0 d)x4+5x2-36=0
bài 2: a)y(x-2)+3x-6=2 b)xy+x+y+3=0
c)xy+3x-2y-7=0 d)xy-x+5y-7=0
