\(3\left|x\right|+8=17\Rightarrow3\left|x\right|=9\)
\(\Rightarrow\left|x\right|=3\Rightarrow x=\pm3\)
\(\Rightarrow x=\left\{-3;3\right\}\)
3|x|=17-8
3|x|=9
|x|=9:3
|x|=3
Vậy x =3
Bài 6. Tìm x Z, sao cho:
a. (x – 3) – 12 = – 25
f. 121 – (35 – x) = 2.52
c. 72 – (84 – 9x) : 7 = 69
g. 2(17 + x) – (400 – 325) = – 31
d. (x + 7).(x – 5) =0
h. (x – 10).(x2 – 9) = 0
e. (x + 8).(x2 + 1) = 0
i. 17 – { – x + [– x – (– x)]} = – 16
Bài 46:
11, - 4|x-2| = -8
12, 5|x+2| = -10(-2)
13, 6|x-2| = 18: (- 3)
14, -7|x+4| = 21 : (-3)
15, 4|x+1| = 8(-2) - 8(-5)
16, 3|x+5| = -9
17, -8|x-3| = 24 - 16: 2
18, -3|x+6| = 6.2 -9
19, 5-|x+7| = 4
20, 12-|x+8| = 10
Giúp mk nha. Mk càn ngay đó
Tìm x :
a) \(1+3+5+7+...+\left(2x-1\right)=750\)
b) \(1+5+9+13+17+...+x=501501\)
Bài 1 : a, (-175)-123+3+175+(-3)
b, 17 . 85+15 .17 -150
c, 176: ( 4. 5 mũ 2 - 3 . 2 mũ 2 )
Bài 2 : Tìm số nguyên x biết :
a,8-x = -12
b, 20 +2 mũ 3 . x = 5 mũ 2 . 4
c, 2 | x -1 | +5 =15
II. Tự luận
Câu 16: Thực hiện phép tính (Tính nhanh nếu có thể)
a) 5.(–8).2.(–3) b) 3.(–5)2 + 2.(–5) – 20
c) 34.(15 –10) – 15.(34 –10)d) 27.(-17) + (-17).73
e) 512.(2 – 128) – 128.(-512)
Câu 17: Tìm x Z , biết:
a) 5 – (10 – x) = 7 b) (4x – 2)(x + 5) = 0
c) 2x – 9 = -8 – 9 d) 3. | x-1 | -27 = 0
e) 5.(3x + 8) –7.(2x + 3) = 16
Tìm x :
a) \(\left|x+\dfrac{11}{17}\right|+\left|x+\dfrac{2}{17}\right|+\left|x+\dfrac{4}{17}\right|=4x\)
b) \(\left|x+\dfrac{1}{2}\right|+\left|x+\dfrac{1}{6}\right|+\left|x+\dfrac{1}{12}\right|+\left|x+\dfrac{1}{20}\right|+..+\left|x+\dfrac{1}{110}\right|=11x\)
Bài 1: Tìm x,y
a, -3.x -30 = -60
b, x.y = 7
c, ( x-1 ). ( y+2 ) = -5
d, 2.x -3 = 5.x -7
e, ( -2 )2 - 8.x = 20
f, 17- ( -31 ) + 3.x = 2x - ( -50 )
g, 2. y2 - 16 = 34
1/Tìm các số nguyên x,y:a)x/3=4/y b)x/y=4/y c)2/x=x/8
2/Rút gọn:
a)4x7/9x32 b)3x21/14x15 c)9x6-9x3/18 d)17x15-17/3-20 e)2x5x13/26x35 f)49+7x49/49
