tìm x
a, 41846 : [ x - 384 ] = 98
b, 25 : x + 15 : x = 40
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a)
75 X(x+157)=24450
x+157 =24450:157
x+157 =326
x =326-7
x =319
b)41846: (x-384)=98
x-384 =41846:98
x-384 =427
x =427+384
x =811
x-384 =
a) 75 x ( X + 157 ) = 24450
X + 157 = 24450 : 75
X + 157 = 326
X = 326 - 157
X = 169
Vậy X = 169
b) 41846 : ( X - 384 ) = 98
X - 384 = 41846 : 98
X - 384 = 427
X = 427 + 384
X = 811
Vậy X = 811
a) x + 10 = 20
<=> x = 20 - 10 = 10
Vậy x = 10
b) 2x + 15 = 35
<=> 2x = 35 - 15 = 20
<=> x = 10
Vậy x = 10
c) 3(x + 2) = 15
<=> x + 2 = 15 : 3 = 5
<=> x = 5 - 2 = 3
Vậy x = 3
d) 10x + 15.11 = 20.10
<=> 10x + 165 = 200
<=> 10x = 200 - 165 = 35
<=> x = 35 : 10 = 3,5
Vậy x = 3,5
e) 4(x + 2) = 3.4
<=> x + 2 = 3
<=> x = 3 - 2 = 1
Vậy x = 1
f) 33x + 135 = 26.9
<=> 33x + 135 = 234
<=> 33x = 234 - 135 = 99
<=> x = 99 : 33 = 3
Vậy x = 3
g) 2x + 15 + 16 + 17 = 100
<=> 2x + 48 = 100
<=> 2x = 100 - 48 = 52
<=> x = 52 : 2 = 26
Vậy x = 26
h) 2(x + 9 + 10 + 11) = 4.12.5
<=> x + 30 = 120
<=> x = 120 - 30 = 90
Vậy x = 90
75 x (x + 157) = 24450
x + 157 = 24450 : 75
x = 326 - 157
x = 169
14700 : (x + 47) = 84
x + 47 = 14700 : 84
x = 175 - 47
x = 128
69 x (x - 157) = 18837
x - 157 = 18837 : 69
x = 273 + 157
x = 430
41846 : (x - 384) = 98
x - 384 = 41846 : 98
x = 427 + 384
x = 811
7649 + X x 54 = 33137
X x 54 = 33137 - 7649
x = 25488 : 54
x = 472
35320 - X x 72 = 13072
X x 72 = 35320 - 13072
x = 22248 : 72
x = 309
4057 + (x : 38) = 20395
x : 38 = 20395 - 4057
x = 16338 x 38
x = 620844
21683 - (x : 47) = 4857
x : 47 = 21683 - 4857
x = 16826 x 47
x = 790822
5 + ( x + 27 ) = 64
( x + 27 ) = 64 - 5 ( x + 27 ) = 59 x = 59 - 27 x = 32a) \(\Rightarrow x+27=59\Rightarrow x=32\)
b) \(\Rightarrow x-2=39\Rightarrow x=41\)
c) \(\Rightarrow x+5=-322\Rightarrow x=-327\)
d) \(\Rightarrow5x=35\Rightarrow x=7\)
e) \(\Rightarrow4\left(x-5\right)=56\Rightarrow x-5=14\Rightarrow x=19\)
f) \(\Rightarrow15+x=37\Rightarrow x=22\)
g) \(\Rightarrow7\left(13-x\right)=35\Rightarrow13-x=5\Rightarrow x=8\)
h) \(\Rightarrow10\left(x+1\right)=100\Rightarrow x+1=10\Rightarrow x=9\)
\(a,\left(2\times x-40\right):10=-55\)
\(2\times x-40=-55\times10\)
\(2\times x-40=-550\)
\(2\times x=-550+40\)
\(2\times x=-510\)
\(x=-510:2\)
\(\Rightarrow x=-255\)
\(b,\left(2\times x+15\right):5=-40\)
\(2\times x+15=-40\times5\)
\(2\times x+15=-200\)
\(2\times x=-200-15\)
\(2\times x=-215\)
\(x=-215:2\)
\(\Rightarrow x=-\dfrac{215}{2}\)
\(c,\left(2\times x-72\right):8=25\)
\(2\times x-72=25\times8\)
\(2\times x-72=200\)
\(2\times x=200+72\)
\(2\times x=272\)
\(x=272:2\)
\(\Rightarrow x=136\)
a) Ta có: \(\left(-12\right)-\left|13-x\right|=-21\)
\(\Leftrightarrow-\left|x-13\right|-12=-21\)
\(\Leftrightarrow-\left|x-13\right|=-9\)
\(\Leftrightarrow\left|x-13\right|=9\)
\(\Leftrightarrow\left[{}\begin{matrix}x-13=9\\x-13=-9\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=22\\x=4\end{matrix}\right.\)
Vậy: \(x\in\left\{22;4\right\}\)
b) Ta có: \(8\le\left|x\right|< 9\)
\(\Leftrightarrow\left|x\right|=8\)
\(\Leftrightarrow x\in\left\{8;-8\right\}\)
Vậy: \(x\in\left\{8;-8\right\}\)
c) Ta có: \(x-\left(-25+x\right)=13-x\)
\(\Leftrightarrow x+25-x-13+x=0\)
\(\Leftrightarrow x+12=0\)
hay x=-12
Vậy: x=-12
d) Ta có: \(\left(15-30\right)+x=x-\left(27-\left|-8\right|\right)\)
\(\Leftrightarrow x-15=x-\left(27-8\right)\)
\(\Leftrightarrow x-15-x+19=0\)
\(\Leftrightarrow-4=0\)(vô lý)
Vậy: \(x\in\varnothing\)
41846:(x-384)=98
=> x-384=41846:98
=>x-384=427
=>x=427+384
=>x=811
Vậy x=811
Phải làm như thế mới đúng
a, 41846 : [ x - 384 ] = 98
=> ( x - 384 ) = 41846 : 98
=> x - 384 = 427
=> x = 427 + 384
=> x = 811
b, 25 : x + 15 : x = 40
=> ( 25 + 15 ) : x = 40
=> 40 : x = 40
=> x = 40 : 40
=> x = 1