ta có: \(\left|2x+5\right|=5-2x\)
<=> \(\left[\begin{array}{nghiempt}2x+5=5-2x\\2x+5=2x-5\end{array}\right.\)
<=> \(\left[\begin{array}{nghiempt}4x=10\\0=-10\left(sai\right)\end{array}\right.\)
=> x= 5/2
Tìm x, biết:
a) 5(3x+5)-4(2x-3) = 5x+8(2x+12)+1
b) (2x+3)(x-4)-(3x-5)(x-4) = (5-x).(x-2)
Tìm x,biết :
a) 2x^2-7x+5=0
b) x(2x-5) - 4x+10=0
c) (x-5)(x+5) - x(x-2)=15
d) x^2(2x-3) - 12+8x=0
e) x(x - 1)+5x - 5=0
f) (2x-3)^2 - 4x(x - 1)=5
g) x(5 - 2x)+2x(x - 1)=13
h)2(x+5)(2x - 5)+(x - 1)(5 - 2x)=0
tìm x, biết: (4x+3)2- (2x+5) .(2x-7) =30
Tìm x biết :
a) 3x(12x - 4 ) - 9x( 4x - 3 ) = 30
b) x( 5 - 2x ) + 2x ( x - 1 ) = 15
Tìm x, biết:
a) 3x ( 12x – 4 ) – 9x ( 4x – 3 ) = 30
b) x ( 5 – 2x ) + 2x ( x – 1 ) = 15
Bai1:tìm x biết.
a)4×(x-5)-(x-1)×(4x-3)=5
b) (3x-4)×(x-2)=3x×(x-9)-3
c)(x-5)×(x-4)-(x+1)×(x-2)=7
d)(2x-1)×(x-2)-(x+3)×(2x-7)=3
tìm x
a) (x-5)(x+5) = (x-2)
b) (3-2x)2 - (x-5)(4x+3)= 2(x+5)
c) (7-x)(2x-5)-(7-x)2x= 3(-5+x)
Tìm x, biết:
a) x(x+5).(x-5) - (x+2).(x2- 2x+4)=17
b) (3x-5).(7-5x) - (5x+2).(2-3x)=4
c) 6x2 - (2x+5).(3x-2)=7
d) x(x-4) - (x2-8) = 0
Tìm x biết : 2x-y/5 = 3y-2z/15 và x+z=2y