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Ta có:
x+{(x+3)-[(x+3)-(-x-2)]}=x
x+{(x+3)-[x+3c+x+2]}=x
x+{x+3 -2x-5}=x
x-x-2=x
x=-2
Đáp số: x=-2
x + {(x + 3) - [(x + 3) - (-x - 2)]} = x
x + {(x+3)- [ x + 3 + x - 2]} = x
x+3-x-3-x-2 = 0
(x-x-x) + (3-3-2) = 0
-x + (-2) = 0
-x = 0- (-2)
-x = 2
x = -2
Vậy x = -2
Ai trả lời cho mình sẽ tik cho nhé
(x+1)+(x+2)+(x+3)+...+(x+100)=7450
2x -2^3×3^2=138
(6x-3^4)×7^3=3×74
![](https://rs.olm.vn/images/avt/0.png?1311)
(x+1)+(x+2)+(x+3)+...+(x+100)=7450
(100x+1+2+3+4+...+100)=7450
100x+5050=7450
100x=7450-5050
100x=2400
x=2400:100
x=24
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2 ( x - 3 ) - 3 ( 2 - 3x ) = 4 [ ( 1 - 2x ) + 15 ]
2x - 6 - 6 + 9x = 4 [ 1 - 2 x + 15 ]
2x - 6 -6 + 9x = 4 - 8x + 60
2x + 9x + 8x = 4 + 60 + 6 + 6
19x = 76
=> x = 76 : 19
=> x = 4
Vậy x = 4
\(2\left(x-3\right)-3\left(2-3x\right)=4\left[\left(1-2x\right)+15\right]\)
\(\Rightarrow2x-6-6+9x=4\left[1-2x+15\right]\)
\(\Rightarrow2x-6-6+9x=4-8x+60\)
\(\Rightarrow2x+9x+8x=4+60+6+6\)
\(\Rightarrow19x=76\)
\(\Rightarrow x=76:19=4\)
Vậy x = 4
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7 . (2 + x) - 6 . (x - 3) = 18
=> 7 . 2 + 7x - (6x - 6 . 3) = 18
=> 14 + 7x - (6x - 18) = 18
=> 14 + 7x - 6x + 18 = 18
=> (7x - 6x) + (14 + 18) = 18
=> x + 32 = 18
=> x = 18 - 32
=> x = -14
Vậy x = -14
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`Answer:`
`(2/3+x)-(-1/2)=3/5`
`<=>2/3+x=3/5-1/2`
`<=>2/3+x=\frac{1}{10}`
`<=>x=\frac{1}{10}-2/3`
`<=>x=\frac{-17}{30}`
`-3/4-(x-7/2)=1/2+(-2/3)`
`<=>-3/4-(x-7/2)=-1/6`
`<=>x-7/2=-3/4-(-1/6)`
`<=>x-7/2=-3/4+1/6`
`<=>x-7/2=-\frac{7}{12}`
`<=>x=\frac{-7}{12}+7/2`
`<=>x=\frac{35}{12}`
Nhanh mà k đúng thj sao hihi
\(\left(x+2\right)+\left(x+3\right)=x\)
\(\Leftrightarrow x+2+x+3=x\)
\(\Leftrightarrow2x+5=x\)
\(\Leftrightarrow2x-x=-5\)
\(\Leftrightarrow x=-5\)