\(\left(15-x\right)+\left(x-12\right)=7-\left(-5+x\right)\)
\(\Rightarrow15-x+x-12=7+ 5-x\)
\(\Rightarrow-x+x+x=12-15+12\)
\(\Rightarrow x=9\)
Vậy \(x=9.\)
tìm x
a)-5.(-x+7)-3.(-x-5)=-4.(12-x)+48
b) (-x-7)-5.(-x-3)=12.(3-x)
c)-2.(15-3x)-4.(7x+8)=-5-9.(-2x+1)
d) (-3x-7) - 4.(-2x-11)=7.(4x+10)+9
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
a) -12.(x-5)+7(3-x)=15
b) 30.(x+2)-6.(x-5)-24.x=100
-5x- 16 = 40 + x
4x - 10 = 15 - x
- 12 ( x - 5 ) + 7 ( 3 - x ) = 5
( x - 2 ) . ( x + 15 ) = 0
( x - 2 ) . ( x2 - 1 ) = 0
( 7 - x ). | x + 19 | = 0
( x - 3 ) . ( x - 5 ) < 0
(Giúp mifh với )
Tìm x biết rằng:
\(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-2}{3}\)
b) Tìm tập hợp các số của x biết rằng:
\(\dfrac{-7}{15}+\dfrac{4}{30}+\dfrac{12}{45}< _-\dfrac{x}{15} < _-\dfrac{3}{5}+ \dfrac{4}{15}+\dfrac{-2}{5}\)
tìm x€Z :
a) -12 (x -5)+7 (3- x) = 5
b) (x - 2)(x + 4) = 0
c) (x - 2)(x + 15) = 0
d) (7-x)(x + 19) = 0
13) -12( x - 5 ) + 7( 3 - x ) = 5
14) ( x - 2 ) . ( x + 4 ) = 0
15) ( x - 2 ) . ( x + 15 ) = 0
16) ( 7 - x ) . ( x + 19 ) = 0
17 ) -5 < x < 1
18) \(\left|x\right|\) < 3
19) ( x - 3 ) ( x - 5 ) < 0
20) 2x2 - 3 = 29
Tìm x thuộc z biết:
3) / x - 14/ = 12 - (-3) - /15/
4) / x + 10 / = 5 - (-7) + /-6/
Tìm x thuộc z biết:
5) /x - 4/ = - ( -10) + /-4/ - 12
6) /x - 7/ = -3 + (-15) + /-18/
