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9-25=(7-x)-(25+7)
( 7 - x ) - ( 25 + 7 ) = 9 - 25
( 7 - x ) - 32 = - 16
7 - x = ( - 16 ) + 32
7 - x = 16
x = 7 - 16
x = - 9
Vậy x = - 9
9 - 25 = ( 7 - x ) - ( 25 + 7 )
x = 7 - 25 - 7 - 9 + 25
x = ( 7 - 7 ) + ( 25 - 25 ) -9
x = 0 + 0 - 9
x= - 9
=> x= - 9
Vậy x = - 9
9-25=(7-x)-(25+7)
9-25=(7-x)-32
suy ra:(7-x)-32=9-25
(7-x)-32=-16
7-x=-16+32
7-x=16
x=7-16
x=-9
\(\left(x-7\right)\left(x+2019\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-7=0\\x+2019=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=7\\x=-2019\end{cases}}\)
\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Leftrightarrow-16=7-x-25-7\)
\(\Leftrightarrow-x=-16+25\)
\(\Leftrightarrow-x=9\)
\(\Leftrightarrow x=-9\)
\(2\left(4x-2x\right)-7x=15\)
\(\Leftrightarrow4x-7x=15\)
\(\Leftrightarrow x=-5\)
a ) 9 - 25 = ( 7 - x ) - ( 25 + 7 )
9 - 25 = 7 - x - 25 - 7
9 - 25 - 7 + 25 + 7 = -x
9 = - x
=> x = -9
Vậy x = -9
b) 2 . ( 4x - 2x ) - 7x = 15
8x - 4x - 7x = 15
-3x = 15
x = 15 : ( - 3 )
x = -5
Vậy x = -5
c ) ( x - 7 ). ( x + 2019 ) = 0
=> x - 7 = 0 hoặc x + 2019 = 0
=> x = 7 hoặc x = - 2019
vậy x \(\in\){ 7 ; -2019 }
a) |x + 4| = 17
=> \(\orbr{\begin{cases}x+4=17\\x+4=-17\end{cases}}\)
=> \(\orbr{\begin{cases}x=13\\x=-21\end{cases}}\)
b) (7 - x) - (25 + 7) = -25
=> (7 - x) - 32 = -25
=> 7 - x = -25 + 32
=> 7 - x = 7
=> x = 7 - 7
=> x = 0
c. |x + 5| = |-7|
=> |x + 5 | = 7
=> \(\orbr{\begin{cases}x+5=7\\x+5=-7\end{cases}}\)
=> \(\orbr{\begin{cases}x=2\\x=-12\end{cases}}\)
2) 4 . (-5)2 + 2 . (-15)
= 2. 2 . 25 + 2 . (-15)
= 2.(2 . 25 - 15)
= 2 . 35
= 70
9-25=(7-x)-(25+7)
-16=7-x-32
7-x-32=16
7-x=-16+32
7-x=16
x=16+7
x=23
B,35-3.|x|=5.(2^3-4)
35-3.x=5.(8-4)
35-3.x=5.4
35-3.x=20
3.x=35-20
3.x=15
X=15:3
x =5
C, -6x=18
-6.x=18
X=18:(-6)
X= -3
D,10+2.|x|=2.(3^2-1)
10+2.x=2.8
10+2.x=16
2.x=16-10
2.x =6
X=6:2
x=3
Ok k mk nha
a) 9 - 25 = ( 7 - x) - (25+7)
- 16 = 7-x - 32
7 - x - 32 = -16
7 - x = -16 + 32
7 - x = 16
x = 16 + 7
x = 23
b) -6x = 18
- 6 .x = 18
x = 18 : (-6)
x = -3
a, x-(17-x)=x-7
x-17+x = x-7
(x+x) - 17 = x - 7
2x - 17 = x - 7
2x - x = -7 + 17
1x = 10
x = 10
vậy_____
b, 9-25 = (7-x)-25+7
-16 = 7-x - 25 + 7
-16 = 7-x - (25-7)
-16 = 7-x - 18
-16 + 18 = 7 - x
2 = 7- x
2 - 7 = x
-5 = x
vậy____
x - ( 17 - x ) = x - 7
x - 17 + x = x - 7
x + x - x = 17 - 7
x = 10
9 - 25 = ( 7 - x ) - 25 +7
-16 = 7 - x - 25 + 7
- 16 = 7 - 32 - x
- 16 = -25 - x
x = - 25 - ( - 16 )
x = -9
Trả lời:
\(a,\)\(-9-25=\left(7-x\right)-\left(-25+7\right)\)
\(\Leftrightarrow-34=7-x-\left(-18\right)\)
\(\Leftrightarrow-34=7-x+18\)
\(\Leftrightarrow-34=25-x\)
\(\Leftrightarrow x=59\)(Thỏa mãn \(x\inℤ\))
Vậy x = 59
\(b,\)\(x-\left(17-x\right)=x-7\)
\(\Leftrightarrow x-17+x=x-7\)
\(\Leftrightarrow2x-17=x-7\)
\(\Leftrightarrow x=10\)(Thỏa mãn\(x\inℤ\))
Vậy x = 10
Banh Bao Tong
\(\left(7-x\right)-\left(25+7\right)=-25\)
7-x-25-7=-25
-x-25=-25
-x=0
x=0
(7-x)-(25+7)=-25
(7-x)-32=-25
7-x=(-25)+32
7-x=7
x=7-7
x=0
vậy x=0