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a) \(13\cdot\left(7-x\right)=26\)
\(\Rightarrow7-x=\dfrac{26}{13}\)
\(\Rightarrow7-x=2\)
\(\Rightarrow x=7-2\)
\(\Rightarrow x=5\)
b) \(\left(4x-18\right):3=2\)
\(\Rightarrow4x-18=2\cdot3\)
\(\Rightarrow4x-18=6\)
\(\Rightarrow4x=6+18\)
\(\Rightarrow4x=24\)
\(\Rightarrow x=24:4\)
\(\Rightarrow x=6\)
c) \(2\cdot x+98\cdot2022=98\cdot2023\)
\(\Rightarrow2\cdot x=98\cdot2023-98\cdot2022\)
\(\Rightarrow2\cdot x=98\cdot\left(2023-2022\right)\)
\(\Rightarrow2\cdot x=98\cdot1\)
\(\Rightarrow x=\dfrac{98}{2}\)
\(\Rightarrow x=49\)
d) \(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+...+\left(x+101\right)=?\)
Thiếu đề
a) \(13.\left(7-x\right)=26\)
\(7-x=26:13\)
\(7-x=2\)
\(x=7-2\)
\(x=5\)
b) \(\left(4x-18\right):3=2\)
\(4x-18=6\)
\(4x=6+18\)
\(4x=24\)
\(x=24:4\)
\(x=6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2x+5}{x+1}\in N\\ \Leftrightarrow2x+5⋮x+1\\ \Rightarrow2\left(x+1\right)+3⋮x+1\\ \Rightarrow3⋮x+1\)
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Bài 1:
a: x/-2=-18/x
=>x2=36
=>x=6 hoặc x=-6
b: x/2+x/5=17/10
=>7/10x=17/10
hay x=17/7
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(1+3+5+7+...+1995)+2x=996006
[(1995+1).998 : 2] + 2x = 996006
996004+2x=996006
=> 2x = 2
=> x=1
(1+3+5+7+...+1995)+2x=996006
[(1995+1).998 : 2] + 2x = 996006
996004+2x=996006
=> 2x = 2
=> x=1
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Rightarrow1,5x+3,5+x=18\)
\(\Rightarrow\left(1,5+1\right)x+3,5=18\)
\(\Rightarrow2,5x=18-3,5\)
\(\Rightarrow2,5x=14,5\)
\(\Rightarrow x=14,5:2,5=5,8\)
vậy.......
150% x + 7/2 +x =18
3/2 x +7/2 +x = 18
\(x\times\left(\frac{3}{2}+1\right)+\frac{7}{2}=18\)
\(x\times\frac{5}{2}+\frac{7}{2}=18\)
\(x\times\frac{5}{2}=18-\frac{7}{2}\)
\(x\times\frac{5}{2}=\frac{29}{2}\)
\(x=\frac{29}{2}:\frac{5}{2}\)
\(x=\frac{29}{5}\)
Chúc bn học tốt !!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
e)
7/8 . x = 4/9 - -2/3
7/8 .x = 10/9
x = 10/9 : 7/8
x = 80/63
f )
-5/7 : x = -7/18 - 1/6
-5/7 : x = -5/9
x = -5/7 : -5/9
x = 9/7
d)
7/18 . x =5/18 + 2/3
7/18 . x =17/18
x = 17/18 : 7/18
x = 17/7
![](https://rs.olm.vn/images/avt/0.png?1311)
150%xX+7/2xX+X=18
=1,5xX+3,5xX+Xx1
=Xx(1,5+3,5+1)
=Xx6
X=18:6
X=3
kg biết