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9 - 25 = ( - 7 - x ) - ( 25 - 7 )
9 - 25 = - 7 - x - 25 + 7
9 - 25 = - x - 25
- 14 = - x - 25
=> x thuộc rỗng
11 + ( 15 - 11 ) = - 4 . x - ( 25 - 10 )
11 + 15 - 11 = - 4 . x - 25 + 10
15 = - 4 . x - 15
=> = - 4 . x
17 - { - x - ( - x ) } = - 1
17 + x + x = - 1
17 + 2x = - 1
2x = - 1 - 17
2x = - 18
x = - 18 : 2
x = - 9
=> - x = 9
x + { ( x + 3 ) - [ ( x + 3 ) - ( - x - 2 )]} = x
x + { x + 3 - [ x + 3 + x + 2 ]} = x
x + x + 3 - x - 3 - x - 2 = x
x - x - 2 = 2
x - 2 = 2 - x
=> x = 0
( x + 1) + ( x + 2) = 17
=> 2x + 3 = 17
=> 2x = 14
=> x = 7
b, tương tự
c, ( 4 - x) . 9 - 26 : 13 = 25
=> (4-x) . 9 -26 = 325
=> (4 - x) . 9 = 351
=> 4 - x = 39
=> x = -35
\(23\left(x-1\right)+19=65\)
\(23\left(x-1\right)=65-19\)
\(23\left(x-1\right)=46\)
\(x-1=46:23\)
\(x-1=2\)
\(x=2+1\)
\(x=3\)
\(5x+3x=88\)
\(x\left(5+3\right)=88\)
\(x.8=88\)
\(x=88:8\)
\(x=11\)
\(x^3=64\)
\(x^3=4^3\)
\(\Rightarrow x=4\)
\(\left(5x-4\right):7-2=6\)
\(\left(5x-4\right):7=6+2\)
\(\left(5x-4\right):7=8\)
\(5x-4=8.7\)
\(5x-4=56\)
\(5x=56+4\)
\(5x=60\)
\(x=60:5\)
\(x=12\)
\(x^{50}=x\)
\(\Rightarrow x=1\)
\(4.2^x-3=125\)
\(4.2^x=125+3\)
\(4.2^x=128\)
\(2^x=128:4\)
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
k mk nha
\(\left(x-7\right)\left(x+2019\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-7=0\\x+2019=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=7\\x=-2019\end{cases}}\)
\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Leftrightarrow-16=7-x-25-7\)
\(\Leftrightarrow-x=-16+25\)
\(\Leftrightarrow-x=9\)
\(\Leftrightarrow x=-9\)
\(2\left(4x-2x\right)-7x=15\)
\(\Leftrightarrow4x-7x=15\)
\(\Leftrightarrow x=-5\)
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 }
\(\text{1, (32-x)+(-7+/x/)-(/-x/+25)-45}=32-x-7-x-x-25-45\)
\(=-45-3x\)
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