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a) 25 : x = x
25 = x^2
x^2 = ( +-5 )^2
b) 3358 : 23 = 2x - 6
146 = 2x - 6
2x = 152
x = 76
c) ( 2x + 1 )^3 = 27 = 3^3
=> 2x + 1 = 3
=> 2x = 2
=> x = 1
d) ( x - 2 )^3 = ( x - 2 )^2
( x - 2 )^2 . ( x - 2 ) - ( x -2 )^2 = 0
( x - 2 )^2 . [ ( x - 2 ) - 1 ] = 0
+) x - 2 = 0
=> x = 2
+) x - 2 - 1 = 0
x - 3 = 0
x = 3
\(25\div x=x\Rightarrow x.x=25\Rightarrow x^2=25\Rightarrow\orbr{\begin{cases}x=5\\x=-5\end{cases}}\)
\(3358\div23=2x-6\)
\(\Rightarrow2x-6=146\)
\(\Rightarrow2x=152\)
\(\Rightarrow x=\frac{152}{2}=76\)
\(\left(2x+1\right)^3=27\)
Mà \(3^3=27\)
Nên \(\left(2x+1\right)^3=3^3\)
\(\Rightarrow2x+1=3\Rightarrow2x=2\Rightarrow x=1\)
\(\left(x-2\right)^3=\left(x-2\right)^2\)
\(\Rightarrow\left(x-2\right)^3-\left(x-2\right)^2=0\)
\(\Rightarrow\left(x-2\right)^2.\left(x-2-1\right)=0\)
\(\Rightarrow\left(x-2\right)^2.\left(x-3\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x-3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=3\end{cases}}}\)
Vậy......................
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-16 + 23 + x = -16
7 + x = -16
x = -16 - 7
x = -23
2x + 35 = -15
2x = -15 - 35
2x = -50
x = -25
-13 x |x | = -26
x = -26 : (-13)
x = 2
Vậy x = 2 hoặc -2
|2x - 5| = 13
2x = 13 + 5
2x = 18
x = 9
(x - 3) x (x + 2) = 0
\(\Leftrightarrow\orbr{\begin{cases}x-3=0\\x+2=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-2\end{cases}}\)
2)2x+35=-15
2x =-15-35
2x = -50
x =-25
1)-16+23+x=-16
7+x =-16
x =-16-7
x =-23
3)-13 * lxl =-26
lxl = -26:-13
lxl =2
<=>x=-2 hoac x=2
5) (x-3).(x+2) =0
<=>\(\orbr{\begin{cases}x-3=0\\x+2=0\end{cases}}\) <=>\(\orbr{\begin{cases}x=3\\x=-2\end{cases}}\)
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a) 1 3 + 2 3 : x = − 7
⇔ 2 3 : x = − 7 − 1 3 ⇔ 2 3 : x = − 22 3 ⇔ x = 2 3 : − 22 3 ⇔ x = − 1 11
b) 2 3 : x = 1 , 4 − 12 5
⇔ 2 3 : x = − 7 5 ⇔ x = 2 3 : − 7 5 ⇔ x = − 10 21
c) 4 , 5 − 2 x .1 4 7 = 11 14
⇔ 4 , 5 − 2 x = 11 14 : 11 7 ⇔ 9 2 − 2 x = 1 2 ⇔ 2 x = 4 ⇔ x = 2
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a)
\(13x+3=16\\ 13x=16-3\\ 13x=13\\ x=13:13\\ x=1\)
b)
\(2x-138=24:23\\ 2x-138=\dfrac{24}{23}\\ 2x=\dfrac{24}{23}+138\\ 2x=\dfrac{3198}{23}\\ x=\dfrac{3198}{23}:2\\ x=\dfrac{1599}{23}\)
@ Nguyễn Quốc Đạt em bị nhầm đề bài nhé
2\(x\) - 138 = 24 : 23
2\(x\) - 138 = 2
2\(x\) = 2 + 138
2\(x\) = 140
\(x\) = 140 : 2
\(x\) = 70
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a, ( x + 17 ) : 21 + 3 = 7
( x + 17 ) : 21 = 7 - 3
( x + 17 ) : 21 = 4
x + 17 = 4 x 21
x + 17 = 84
x = 84 - 17
x = 67
b, 3x+3 - 13 = 230
=> 3x + 3 = 230 + 13
=> 3x+3 = 243
=> 3x+3 = 35
=> x + 3 = 5
=> x = 5 -3
=> x = 2
c, 2x - 15 = 23
2x = 23 + 15 = 38
x = 38 : 2
x = 19
d, ( x + 16 ) : 31 - 3 = 7
( x + 16 ) : 31 = 10
x + 16 = 10 x 31 = 310
x = 310 - 16
x = 294
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a) ( x + 216 ) : 61 + 1 = 202
( x + 216 ) : 61 = 201
( x + 216 ) = 12261
x = 12045
b) 1818 : ( 6x - 37 ) + 1 = 19
1818 : ( 6x - 37 ) = 18
( 6x - 37 ) = 101
6x = 138
x = 23
c) ( x : 23 + 45 ) x 67 + 3 = 8914
( x : 23 + 45 ) x 67 = 8911
x : 23 + 45 = 133
x : 23 = 88
x = 2024
(x + 216) : 61 + 1 = 202
=> (x + 216) : 61 = 201
=> x + 216 = 12261
=> x = 12045
vậy_
1818 : (6x - 37) + 1 = 19
=> 1818 : (6x - 37) = 18
=> 6x - 37 = 101
=> 6x = 138
=> x = 23
vậy_
(x : 23 + 45) x 67 + 3 = 8914
=> (x : 23 + 45) x 67 = 8911
=> x : 23 + 45 = 133
=>x : 23 = 88
=> x = 2024
vậy_
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25-{14-[(2-x)-(x+13)+23]}=62-{8-[(2x-10)-(29-3x)+8]}
<=>25-14+2-x-x-13+23=62-8+2x-10-29+3x+8
<=>13-x-x-13+23=2x+3x+8-10-29
<=>-x-x+23=2x+3x+(-31)
<=>23-(x+x)=2x+2x-31
<=>23-2x=2x+3x-31
<=>23+31=2x+2x+3x
<=>54=x(2+2+3)
<=>54=x.7
=>x=54/7
Vậy x=54/7
<=>54=x.7
\(25\div x=x\Leftrightarrow25=x.x\Leftrightarrow25=x^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=-5\\x=5\end{cases}}\)
\(3358\div23=2x-6\)
\(\Leftrightarrow146=2x-6\)
\(\Leftrightarrow2x=152\Leftrightarrow x=76\)
\(2782\div\left[216-\left(x-3\right)\right]=13\)
\(\Leftrightarrow216-\left(x-3\right)=214\)
\(\Leftrightarrow x-3=2\)
\(\Leftrightarrow x=5\)
25:x=x=>x2=25=>x=5
3358:23=2x-6=>2x-6=146=>2x=152=>x=76
2782:[216-(x-3)=13
=>2782:13=216-(x-3)
=>214 =216-(x-3)
=>216-214= x-3
=>x-3 =2
=>x=5
Tk nha, thanks nhìu ^_^