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Cái dề, bài này giúp á, tính ra là ok mà
(13/10x - 15).(-5/14) = 3
13/10x - 15 = 3 : (-5/14)
13/10x - 15 = 3 x (-14/5)
13/10x - 15 = -42/5
=> 13/10x = -42/5 + 15
=> 13/10x = 33/5
=> x = 33/5 : 13/10
=> x = 33/5 x 10/13
=> x = 66/13
bn tự lm típ, tính ra là ok mà
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có: \(-19-\left|+13\right|+\left|-10\right|-\left(-5\right)-11\)
\(=-19-13+10+5-11\)
\(=-28\)
b) Ta có: \(\left(-10\right)-\left(11\right)+\left|-5\right|-\left|-7\right|-8\)
\(=-10-11+5-7-8\)
\(=-31\)
c) Ta có: \(-\left(-8\right)-\left(+7\right)-\left|-11\right|+\left|+12\right|\)
\(=8-7-11+12\)
\(=2\)
d) Ta có: \(-14-\left|-18\right|-\left(-20\right)-\left|-25\right|\)
\(=-14-18+20-25\)
\(=-37\)
đ) Ta có: \(23-\left|-15\right|-\left(-17\right)+\left|-13\right|\)
\(=23-15+17+13\)
\(=38\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(12+x+\left(-5\right)=-18-2x\)
\(\Rightarrow12+x-5=-18-2x\)
\(\Rightarrow x+7+18+2x=0\)
\(\Rightarrow3x=-25\)
\(\Rightarrow x=-\dfrac{25}{3}\)
b) \(\left(-14\right)-x+\left(-15\right)=-10+\left(4-2x\right)\)
\(\Rightarrow-14-x-15=-10+4-2x\)
\(\Rightarrow-x-29=-2x-6\)
\(\Rightarrow-x+2x=-6+29\)
\(\Rightarrow x=23\)
c) \(x-\left(-19\right)-\left(-11\right)=-\left(3x+40\right)\)
\(\Rightarrow x+19+11=-3x-40\)
\(\Rightarrow x+30=-3x-40\)
\(\Rightarrow x+3x=-40-30\)
\(\Rightarrow4x=-70\)
\(\Rightarrow x=-\dfrac{35}{2}\)
M = { 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18+ 19 + 20 }
![](https://rs.olm.vn/images/avt/0.png?1311)
M = 210.
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![](https://rs.olm.vn/images/avt/0.png?1311)
(4/5-2x).14/7=11/4
4/5-2x=11/4:14/7
4/5-2x=11/4.7/14
4/5-2x=11/8
2x = 4/5 - 11/8
2x=32/40 -44/40
2x=- 3/10
x=-3/10:2
x=-3/10.2
x=-3/5
=>(4/5-2x)=11/4:2=11/8
=>2x=4/5-11/8=-23/40
=>x=-23/80
![](https://rs.olm.vn/images/avt/0.png?1311)
11/125-17/18-5/7+4/9+17/14= 0.088
Nhớ nếu đúng nhé
Cảm ơn
![](https://rs.olm.vn/images/avt/0.png?1311)
11/125-17/18-5/7+4/9+17/14
=-1927/2250-5/7+209/126
=-1927/2250+17/18
=11/125
11/14 : (2x +5/7) = 11/ 18
= 2x +5/7 = 11/14 : 11/18
= 2x +5/7 = 9/7
= 2x = 9/7 - 5/7
= 2x = 4/7
= x = 4/7 : 2
=x = 2/7
\(\dfrac{11}{14}:\left(2x+\dfrac{5}{7}\right)=\dfrac{11}{18}\)
`2x+5/7=11/14:11/18`
`2x+5/7=11/14xx18/11`
`2x+5/7=18/14`
`2x+5/7=9/7`
`2x=9/7-5/7`
`2x=4/7`
`x=4/7:2`
`x=4/7 xx 1/2`
`x=2/7`