( 2x - 1 )2 - ( 2x + 5 )( 2x - 5 ) = 20
\(=4x^2+1-4x-\left(4x^2-25\right)=20\)
\(=4x^2+1-4x-4x^2+25=20\)
\(=26-4x=20\)
\(4x=26-20=6\)
\(x=\frac{6}{4}=1,5\)
Tìm x
a. 5x.(12x+7)-3x.(20x-5)=-150
b. ( 2x-1).(3-x)+(x+4).(2x-5)=20
c. 9x2-1+(3x-1)2=0
d. 3x.(x-2)-(3x+2).(x-1)=7
e. (2x-1)2-(2x+5).(2x-5)=20
f. 4x2-5=4
Tìm x:
a) (x-20) mũ 2 -(x+1)(x+3)=-7
b) (3x+5)(4-3x)=0
c) x mũ 3 -9x=0
d)2/3x (x mũ 2 -4)=0
e) (2x+1)-x(2x+1)=0
f)(2x-1) mũ 2 -(2x+5) (2x-5) =18
g)x mũ 2 -25 =6x-9
1) tìm x :
a) (x-3)(x+3)-(x+5)(x-1)=6
b)(3x-2)^2-(2x+1)^2-(5x-1)(x+1)=20
c)(2x+1)(4x^2-2x+1)+(3-2x)(9+6x+4x^2)+12x=4
Tìm x: a) 2x(x-5)-x(3+2x)=26
b) (x+4)2-(x+1)(x-1)=16
c) (2x-1)2-4(x+7)(x-7)=0
d) x(x-5)-4x+20=0
tìm x: |x^2-2x-1|=14
||2x-3|-5|+7=20
tìm x
a) 2x(x-5)-2x2 = 20
b)5x(2x-7)+2x(8-5x)=5
c)4x(7x-5)-7x(4x-2)= -12
ghi cả cách làm
tìm x:
a)3(2x-3)+2(2-x)=-3
b)2x(x2-2)+x2(1-2x)-x2=-12
c)3x(2x+3)-(2x+5)(3x-2)=8
d)4x(x - 1) - 3(x2-5)-x2=(x-3)-(x+4)
e)2(3x-1)(2x+5)-6(2x-1)(x+2)=-6
. Tìm x, biết:
a) 6x.(x – 5) + 3x.(7 – 2x) = 18 b) 2x.(3x + 1) + (4 – 2x).3x = 7 c) 0,5x.(0,4 – 4x) + (2x + 5).x = -6,5 | d) (x + 3)(x + 2) – (x - 2)(x + 5) = 6 e) 3(2x - 1)(3x - 1) – (2x - 3)(9x - 1) = 0 |
TÌm x
a. 5x.3x+7)-15x2 = 70
b. 3x.(x+7)=21-3x2 = 0
c. x(5-2x)+2x.(x-1) = 0
d. 4x.(x-5)-4x2 = 60
e. (x-3)3+(5-x)2 = 12
g. (2x-1)2-(2x+4)2 = 0
h.( 2x-3).(3x+1)-x.(6x+10) = 30
k. (2x -1).(8x+5)- (4x +3)2 = 20
