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- ( x + 75 ) + 123 = - 23
- x - 75 + 123 = - 23
- x - 75 = - 23 - 123
- x - 75 = - 146
- x = - 146 + 75
- x = - 71
=> x = 71
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x + ( 123 + 456 ) - ( 23 + 56 ) = 789
x+579-79=789
x+579=789+79= 1568
x=1568-579=989
nhớ kick cho ình nha
Tìm x :
x + ( 123 + 456 ) - ( 23 + 56 ) = 789
x + 579 - 79 = 789
x + 579 = 789 + 79 = 868
x = 868 - 579
x = 289
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=> 143 - 3 chia hết cho x
140 chia hết cho x
=> 123 - 23 chia hết cho x
100 chia hết cho x
=> x thuộc ƯC(140 ; 100)
UCLN(140 ; 100) = 20
Vậy x thuộc {1;2;4;5;10;20}
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( -23 ) + 105 = 105 - 23
= 82
78 + ( -123 ) = -( 123 - 78 )
= -45
( -23) + 13 = -( 23 - 13 )
= -10
( -23 ) + ( -13 ) = -( 23 + 13 )
= - 36
( -75 ) + ( -50 ) = -( 75 + 50 )
= -125
( -20 ) + | -88 | = ( -20 ) + 88
= 88 - 20
= 68
| -37 | + (-|15|) = 37 + ( -15 )
= 37 - 15
= 22
(-|-22|) + ( -|16|) = ( -22 ) + ( -16 )
= -38
( -23 ) + 13 + ( -17 ) + 57 = [(-23) + 13 ] + [(-17) + 57 ]
= 10 + 40
= 50
(-123) + |-13| + (-7) = (-123) + 13 + (-7)
= 110 + (-7)
= 103
|0| + |45| + (-|-455|) + |-796| = 0 + 45 + (-455) + 796
= [ 796 + (-455) ] + 45
= 341 + 45
= 386
Tui làm chi tiết lắm rồi đó ^_^
\(=-23-\left(-105\right)=82\)
\(=78-123=-45\)
\(=-23-\left(-13\right)=-10\)
\(=-36\)
\(=-125\)
\(=-20-\left(-88\right)=68\)
Phần dưới tự làm nha
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a) x+ 123 với x= -23
-23 + 123 = 100
b) -203 + y với y= 16
-203 + 16= -187
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123x10000=1230000
239:0,01=23900
23+3=26
2334:x=1
x=2334:1
x=2334
124:x=2
x=124:2
x=62
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Tìm x thuoc z:
1) \(26-\left|x+9\right|=-13\)
\(\Leftrightarrow\left|x+9\right|=26-\left(-13\right)\)
\(\Leftrightarrow\left|x+9\right|=39\)
\(\Leftrightarrow\left[{}\begin{matrix}x+9=39\\x+9=-39\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=39-9=30\\x=-39-9=-48\end{matrix}\right.\)
Vậy: \(x\in\left\{30;-48\right\}\)
2) \(\left|x+7\right|-13=25\)
\(\Leftrightarrow\left|x+7\right|=25+13=38\)
\(\Leftrightarrow x+7\in\left\{38;-38\right\}\)
\(\Leftrightarrow x\in\left\{31;-45\right\}\)
Vậy:.................
tim x biet
\(1)123-3.\left(x+4\right)=23\)
\(\Leftrightarrow3\left(x+4\right)=123-23\)
\(\Leftrightarrow3\left(x+4\right)=100\)
\(\Leftrightarrow x+4=\frac{100}{3}\)
\(\Leftrightarrow x=\frac{100}{3}-4=\frac{100-12}{3}=\frac{88}{3}\)
Vậy:................
2) Tương tự
\(123:x-23:x=20\\ \Rightarrow123.\dfrac{1}{x}-23.\dfrac{1}{x}=20\\ \Rightarrow\dfrac{1}{x}.\left(123-23\right)=20\\ \Rightarrow\dfrac{1}{x}.100=20\\ \Rightarrow\dfrac{1}{x}=20:100\\ \Rightarrow\dfrac{1}{x}=\dfrac{1}{5}\\ \Rightarrow x=5\)
Vậy \(x=5\)