Ta có: x<0
=>3x<0
=>|3x|=-(3x)
Vậy: 5x+8+[-(3x)]=0
=>(5x-3x)+8=0
=>2x=0-8
=>2x=-8
=>x=-8:2
=>x=-4
Ta có: x<0
=>3x<0
=>|3x|=-(3x)
Vậy: 5x+8+[-(3x)]=0
=>(5x-3x)+8=0
=>2x=0-8
=>2x=-8
=>x=-8:2
=>x=-4
Tìm x, biết:
x.(2x-8).(x^2-4)=0
-17.|x|=-85
|x|=|-10|
3x + 5 = 4x - 9
72 - 3x=5x+8
(x^2 - 36).(2|x| - 12).x = 0
tìm x
( 3x - 15 )(10 - x)<0
( 2x - 8 ) (6 - x )≥0
( 15 - 5x ) ( 2x - 4)<0
1)2x-8x2=0
2)x-x2=0
3)7x=5x2
4)3x2=x
5) (2x-5)(x+9)+8-6x=0
6) (x+3)(5x-15)+2x-6=0
1) (x-1)(x+5)(-3x+8)=0
2) (x-1)(x-2)(x-3)=0
3) (5x+3)(x^2+4)(x-1)=0
4) x(x^2-1)=0
tìm x thuộc z , biêt
a)3x + 45 . 5x - 45 = 0
b) 3x + 45 . 5x - 45 < 0
c) ( x2 + 3 ) . ( 2x - 2016 ) =0
d) 3x + 45 . 5x - 45 >0
e) 3x + 45 . 5x - 45 = -7
Tìm số tự nhiên x biết:
(x+2)-2=0
(x+3)+1=7
(3x-4)+4=12
(5x+4)-1=13
(4x-8)-3=5
8-(2x-4)=2
7+(5x+2)=14
5-(3x-11)=1
Giúp e vs ạ(Vui lòng trình bày ạ)
Tìm STN x, biết
1) (x + 2) - 2 = 0 2) (x + 3) + 1 = 7
3) (3x - 4) + 4 = 12 4) (5x + 4) - 1 = 13
5) (4x - 8) - 3 = 5 6) 3 + (x - 5) = 7
7) 8 - (2x - 4) = 2 8) 7 + (5x + 2) = 14
9) 5 - (3x - 11) = 1 10) 16 - (8x + 2) = 6
Tìm x:
a) -152-(3x+1) = (-2).(-77)
b) (-1005).(x+2) = 0
c) (8+x). (6-x) = 0
d) | 4-5x| = 24; x ,x<0
e) (2 +x) mũ 2 = 9
tim x nguyen biet:
a 8.(x mu 2 +3).(5-x)
b)(2x + 1)mu 2=25
c) (1-3x)mu3 =64
d)(4-x)mu3 =-27
e) xmu2 -5x =0