(X+6)2-(x-6)(x+6)=0
=>x2+12x+36-(x2-36)=0
=>x2+12x+36-x2+36=0
=>12x+72=0
=>12x=-72
=>x=-6
Nhớ bấm tick cho mà!!
(X+6)2-(x-6)(x+6)=0
=>x2+12x+36-(x2-36)=0
=>x2+12x+36-x2+36=0
=>12x+72=0
=>12x=-72
=>x=-6
Nhớ bấm tick cho mà!!
Tìm x:
a) \(3x\left(3x-8\right)-9x^2+8=0\)
b)\(6x-15-x\left(5-2x\right)=0\)
c) \(x^3-16x=0\)
d) \(2x^2+3x-5=0\)
e) \(3x^2-x\left(3x-6\right)=36\)
f) \(\left(x+2\right)^2-\left(x-5\right)\left(x+1\right)=17\)
g) \(\left(x-4\right)^2-x\left(x+6\right)=9\)
h) \(4x\left(x-1000\right)-x+1000=0\)
i) \(x^2-36=0\)
j) \(x^2y-2+x+x^2-2y+xy=0\)
k) \(x\left(x+1\right)-\left(x-1\right).\left(2x-3\right)=0\)
l) \(3x^3-27x=0\)
Tìm x:
4x(x - 2) + 3x - 6 = 0
3) Thực hiện phép tính
a) 9 - 4 x/5x + 1 +4x /5x
b) 3/x - 2/x-1
c) 3x+6/4x-12×3x -9/x+2
d)
2x-16y/x+1×12y^2/(x+1)^2
4)Tìm x
a) 3(x-5)-x+5=0
b)x(x-3)+x-6=0
tìm x biết
a) x(x+2) - 3x-6=0
b) ( x^3+3x^2 +3x +1) - 3x^2-3x =0
c) 4x^2 - 25 =0
tìm x
a, \(2018x-1+2019x\left(1-2018x\right)=0\)
b, \(\left(x+2\right)^3-x^2\left(x-6\right)=4\)
c, \(\left(x-2\right)^3-\left(x-3\right)\left(x^2+3x+9\right)+6\left(x+1\right)^2=49\)
d, \(x^2-5x+4=0\)
Tìm x biết:
a/ x3- 4x2 - 12x + 27 = 0
b/ 2x2 + x - 6 = 0
Chứng minh rằng: x2 + y2 - 2x - 4y + 6 > 0 với mọi số thực x,y
Tính:
+ 12x6y3 : 4x3y
+ (x+1)(x2 – x + 1)
+ 2x2y(x2+ 3xy)
Phân tích đa thức thành nhân tử:
+ 4x2y + 6 xy2 -8xy
+x2 – 9
+ x2 – 4 +xy – 2y
+x2 - 7x +10
Tìm x biết:
+x2-x( x-2) = 2
+( x-2)2 + x -2= 0
tìm x
a,\(x^2+5x=6\)
b,\(x^2-2015x+2014=0\)