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1) 10 - 3 ( x - 1 ) = -5
3 ( x - 1 ) = 10 - ( - 5 )
3 ( x - 1 ) = 15
x - 1 = 15 : 3
x - 1 = 5
x = 5 + 1
x = 6
2) 3x + 75 = - 15
3x = - 15 - 75
3x = - 90
x = -90 : 3
x = -30
4) 12 - ( x - 7 ) = - 8
x - 7 = 12 - (- 8 )
x - 7 = 20
x = 20 + 7
x = 27
5) x + 75 = 15
x = 15 - 75
x = -60
7) 2x + 18 = 10
2x = 10 - 18
2x = -8
x = - 8 : 2
x = -4
8) 26 - 3x = 5
3x = 26 - 5
3x = 21
x = 21: 3
x = 7
9) x - 12 = - 15
x = -15 + 12
x =-3
10 ) 24 - 2 ( x + 5 ) = 38
2 ( x+ 5 ) = 24 - 38
2 ( x + 5 ) = - 14
x + 5 = -14 : 2
x + 5 = -7
x = -7 - 5
x = -12
còn là bạn tự làm tiếp nhé ! bạn gửi nhiều cầu qua bạn chỉ nên gửi ít một thời như vậy khó có thể giải làm bạn ạ!
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17 - ( - x + 13 ) + ( x - 15 ) = 13 + x - 18
17 + x - 13 + x - 15 = 13 + x - 18
x + x - x = 13 - 18 -17 + 13
=> x = -9
Vậy...
Chúc em học tốt!!!
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\(15-\left[13+x\right]=x-\left[24-18\right]\)
\(15-13-x=x-24+18\)
\(2-x=x-42\)
\(-x-x=-2-\left[-42\right]\)
\(-2x=40\)
\(x=-20\)
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a)15/8+3/4-5/12
=45+18-10/24
=53/24
b)11/24.12/33+5/6
=11.12/12.2.11.3+5/6
=1/6+5/6
=6/6=1
c)15/8+7/24:5/8
=15/8+7/24.8/5
=15/8+7.8/3.8.5
=15/8+7/15
=đề sai, nếu đúng thì như này
=8/15+7/15
=15/15=1
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\(\frac{x+22}{11}+\frac{x+23}{12}=\frac{x+24}{13}+\frac{x+25}{14}\)
\(\Leftrightarrow\left(\frac{x+22}{11}+1\right)+\left(\frac{x+23}{12}+1\right)=\left(\frac{x+24}{13}+1\right)+\left(\frac{x+25}{14}+1\right)\)
\(\Leftrightarrow\frac{x+33}{11}+\frac{x+35}{12}=\frac{x+37}{13}+\frac{x+39}{14}\)
\(\Leftrightarrow\frac{x+33}{11}+\frac{x+35}{12}-\frac{x+37}{13}-\frac{x+39}{14}=0\)
\(\Leftrightarrow\frac{2184\cdot\left(x+33\right)+2002\cdot\left(x+35\right)-1848\cdot\left(x+37\right)-1716\cdot\left(x+39\right)}{24024}=0\)
\(\Leftrightarrow2184x+72072+2002x+70070-1848x-68376-1716x-66924=0\)
\(\Leftrightarrow622x+6842=0\)
\(\Leftrightarrow x=-11\)
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a, 10-x= 18 -18
\(\Leftrightarrow\) x = 10
b, x- 24 = -27
\(\Leftrightarrow\) x = -3
c, - ( x- 6) = -26
\(\Leftrightarrow x-6=26\)
\(\Leftrightarrow\) x = 32
d, -49 -x = 7
\(\Leftrightarrow-x=56\)
\(\Leftrightarrow x=-56\)
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Bài 1:
a: =>x-7/18=-12/29:18/29=-3/2
=>x=-3/2+7/18=7/18-27/18=-20/18=-10/9
Bài 2:
a: \(=\dfrac{1}{4}\cdot\dfrac{7}{3}\cdot30.05\cdot\dfrac{45}{8}=\dfrac{12621}{128}\)
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Bài 1. tìm x :
a, -16 + 23 + x = -16
23 + x = -16-(-16)
23 + x = 0
x = 0 - 23
Vậy: x = -23
b, 2x - 35 = 15
2x = 15 + 35
2x = 50
x = 50 : 2
Vậy: x = 25
c, 3x + 17 = 12
3x = 12 - 17
3x = -5
Vậy: x = -5/3
d, | x - 1 | = 0
x - 1 = 0
x = 0 + 1
Vậy: x = 1
e, -13 . | x | = -26
-13 . x = -26
x = -26 : ( -13 )
Vậy: x = 2
Mik làm bài 1 còn bài 2 bn tự làm nha
Hok tốt!!!
\(15-\left(13+x\right)=x-\left(24-18\right)\)
<=>\(15-13-x=x-6\)
<=>\(\left(-x\right)-x=\left(-6\right)+13-15\)
<=>\(-2x=-8\)
<=>\(x=4\)
\(\Rightarrow15-13-x=x-24+18\)
\(\Rightarrow2-x=x-6\)
\(\Rightarrow2+6=x+x\)
\(\Rightarrow8=2x\)
\(\Rightarrow x=4\)
tiik nha