Tìm x :
a) 3x-17=x+3
b) |x-3|-12=|-5|
c) 2,5-(x-5)=-415-(15-415)
tìm số nguyên x biết:
a)3x-17=x+3
b)|x-3|-12=|-5|
c)25-(x-5)=-415-(15-415)
d)2x-15=-47
e)(-5)^2-(5x-3)=43
g)(x-3)(2x+6)=0
giải nhanh hộ mìh nhé
mình đang cần gấp
1, 3x-17=x+3
2, |x-3|-12=|-5|
3, 25-(x-5)=-415-(15-415)
4, (x-3)(2x+6)=0
1. 3x - 17 = x+3
3x - x = 3 + 17
2x = 20
x = 20 :2
x = 10
2. |x-3| - 12 = |-5|
|x-3| -12 = 5
|x-3| = 5 + 12
|x-3| = 17
=> x-3 = +17 , -17
x - 3 = 17x = 17 + 3
x = 20
x - 3 = -17x = -17 + 3
x = -14
3 . 25 - ( x -5 ) = -415 -( 15 -415)
25 - x +5 = -415 - 15 +415
25 - x +5 = ( -415 + 415) -15
25 - x +5 = 0-5 = -5
25 - x = -5-5
25 - x = -10
x = 25 - -10
x = 35
4. ( x -3 ) . ( 2x +6 ) = 0
=> x-3 = 0 hoặc 2x +6 = 0
x - 3 = 0x = 0 + 3 = 3
2x +6 = 02x = 0-6=-6
x = -6 : 2
x = -3
\(1;3x-17=x+3\)
\(\Leftrightarrow3x-x=3+17\)
\(\Leftrightarrow2x=20\)
\(\Rightarrow x=10\)
\(2;\left|x-3\right|-12=\left|-5\right|\)
\(\Leftrightarrow\left|x-3\right|-12=5\)
\(\Leftrightarrow\left|x-3\right|=5+12\)
\(\Leftrightarrow\left|x-3\right|=17\)
\(\Rightarrow\orbr{\begin{cases}x-3=17\\3-x=17\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=17+3\\-x=17-3\end{cases}\Leftrightarrow\orbr{\begin{cases}x=20\\x=-14\end{cases}}}\)
\(3;25-\left(x-5\right)=-415-\left(15-415\right)\)
\(\Leftrightarrow25-x+5=-415-15+415\)
\(\Leftrightarrow-x=-415-15+415-25-5\)
\(\Leftrightarrow-x=-45\)
\(\Rightarrow x=45\)
\(4;\left(x-3\right)\left(2x+6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\2x+6=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-3\end{cases}}}\)
3x-17=x+3
3x-x=3+17
2x=20
x=10
lx-3l - 12 = l-5l = 5
lx-3l = 5+12=17
<=>\(\orbr{\begin{cases}x-3=17\\x-3=-17\end{cases}\Leftrightarrow\orbr{\begin{cases}x=20\\x=-14\end{cases}}}\)
tìm x :
a) 3 - ( 17 - x ) = 289 - ( 36 + 289 )
b) 25 - ( x + 5) = - 415 - ( 15 - 415 )
c) 3 ( x - 1) - ( x - 5 ) = 8
tìm x
a, |x+3| -12 = |-5|
b, 25 - (x-5) = 415 x (15 - 415 )
a, | x + 3 | - 12 = | -5 |
x + 3 - 12 = 5
x + 3 = 5 + 12
x + 3 = 17
x = 17 - 3 = 14
b, 25 - ( x- 5 ) = 415 x ( 15 - 415 )
25 - ( x - 5 ) = 415 x ( - 400 )
25 - ( x - 5 ) = - 166000
x - 5 = 25 - ( - 166000)
x - 5 = 166025
x = 166025 + 5
x = 166030
CHÚC BẠN HỌC TỐT
tim x \(\in\) Z
3x-17=x+3
Ix-3I-12=I-5I
25-(x-5)=-415-(15-415)
1) \(3x-17=x+3\)
\(3x-x=3+17\)
\(2x=20\)
\(x=10\)
Vậy x=10
2) \(\left|x-3\right|-12=\left|-5\right|\)
\(\left|x-3\right|-12=5\)
\(\left|x-3\right|=17\)
\(\Rightarrow x-3=17\) hoặc \(x-3=-17\)
\(\Rightarrow x=20\) hoặc \(x=-14\)
Vậy x= 20 hoặc x= -14
3) \(25-\left(x-5\right)=-415-\left(15-415\right)\)
\(25-\left(x-5\right)=-15\)
\(-\left(x-5\right)=-15-25\)
\(-\left(x-5\right)=-40\)
\(x-5=40\)
\(x=35\)
Vậy x=35
Bài 2(2,5 điểm) Tìm số nguyên x biết:
a ) 3 - ( 17 - x ) = 289 - ( 36 + 289 )
b ) 25 + ( x-5 ) = - 415 - ( 15 - 415 )
c ) ( - x ) + ( - 62 ) + ( - 46 ) = - 14
d ) 484 + x = - 632 + ( - 548 )
e ) 17 - ( - x + ( - x - ( - x ) ) ) = -16
f ) x - (( - x + ( x + 3 ))) - (( x + 3 ) - ( x - 2 ) = 0
bài 1: tìm x, biết
a, 3-(17-x)=289-(36+289)
b,25-(x+5)=(-415)-(15-415)
c,34+(21-x)=(3747-30) -3746
a)-22: b)35: c)84
tìm số nguyên x,biết
a/ 3-(17-x)=289-(36+289)
b/ 25-(x+5)=-415-(15-415)
c/ 34+(21-x)=(3747-30)-3746
Bài 6: Tìm số nguyên x, biết
A, 3 – (17 – x) = 289 – (36 + 289)
B, 25 – (x + 5) = -415 – (15 – 415)
C, 34 + (21 – x) = (3747 – 30) – 3746
D, -2x – (x – 17) = 34 – (-x + 25)
E, 17x + (-16x – 37) = 2x + 43
G, (x + 12). (x – 3) = 0
H, (-x + 5). (3 – x) = 0
K, -28 – 7. |-3x + 15| = - 70
M, 12 – 2. (-x + 3)2 = - 38
N, - {-3x + 2. [45 – x – 3. (3x + 7) – 2x] + 4x} = 55
Bài 7: So sánh
A, (-99). 98. (-97) với 0
B, (-5). (-4). (-3). (-2). (-1) với 0
C, (-245). (-47). (-199) với 123. (+315)
D, 2987. (-1974). (+243). 0 với 0
E, (-12). (-45) : (-27) với |-1|
A , 3 - ( 17 - x ) = 289 - ( 36 + 289 )
3 - 17 + x = 0 - 36
-14 + x = -36
x = -36 - ( - 14 ) = -22
B, 25 - ( x + 5 ) = -415 - ( 15 - 415 )
25 - x - 5 = 0 - 15
20 - x = -15
x = 20 - ( - 15 ) = 35
C , 34 + ( 21 - x ) = ( 3747 - 30 ) - 3746
34 + 21 - x = 1 - 30
55 - x = -29
x = 55 - (-29 ) = 74
D , -2x - ( x -17 ) = 34 - ( -x + 25 )
- 2x - x + 17 = 34 - 25 + x
- 3x + 17 = 9 + x
- 3x - x = 9 - 17
-4x = -8
x = -8 : ( - 4 )
x = 2
E , 17x + ( -16x - 37 ) = x + 43
17x - 16x -37 = x + 43
x - 37 = x + 43
-37 - 43 = x - x
- 80 = 0 ( vô lý )
G , ( x + 12 ) . (x - 3 ) = 0
\(\hept{\begin{cases}x+12=0\\x-3=0\end{cases}}\)
\(\hept{\begin{cases}x=-12\\x=3\end{cases}}\)