tim x
a)4x(x-7)-4x2=56
b)12x(3x-2)-(4-6x)=0
c)4(x-5)-(5-x)2=0
Biết \(x^2-2x-1=0\). Tính biểu thức \(\dfrac{x^6-6x^5+12x^4-8x^3+2015}{x^6-8x^3-12x^2+6x+2015}\)
Bài 4: Tìm x, biết.
a) 4x(x - 7) - 4x2 = 56
b) 12x(3x - 2) - (4 - 6x) = 0
c) 4(x - 5) - (5 - x)2 = 0
d) x(x +1) - x(x - 3) = 0
e) - 6x + 8 = 0 f) 2 + 2x + = 0
Tim x:
a)(x-2)(x+2)=x.(x-3)
b)x^3+3x^2+3x+28=0
c)x^3-6x^2+12x-9=0
(x/2+3)(5-6x)+12x-2+(x/4+3)=0
Tìm x
(x/2+3)(5-6x)+12x-2+(x/4+3)=0
Tìm x
Tìm x biết rằng:
a) ( x 2 + 2x + 4)(2 - x) + x(x - 3)(x + 4) - x 2 + 24 = 0;
b) x 2 + 3 ( 5 − 6 x ) + ( 12 x − 2 ) x 4 + 3 = 0 .
tim x 8x^3 + 12x^2 + 6x - 26 = 0
Tim x:
a) x(x-2)+x-2=0
b) x3-6x2+12x=8