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a) \(\left(5x+3^4\right).6^8=6^9.3^4\)
\(=>6x+3^4=3^4.6^9:6^8\)
\(=>6x+3^4=3^4.6\)
\(=>6x=6.3^4-3^4\)
\(=>6x=0\)
\(=>x=0:6\)
\(=>x=0\)
a/(5x + 34).68=69.34
(5x + 34) = 69:68.34
5x + 81 = 6.81
5x = 6.81 - 81
5x = 486 - 81
5x = 425
x = 425:5
x = 85
b/92 - 2x = 2.42- 3.4 + 120:15
92 - 2x = 2.16 - 12 + 8
92 - 2x = 32 - 12 + 8
92 - 2x = 28
2x = 92 - 28
2x = 64
x = 64:2
x = 32
c/53.(3x + 2) : 13 = 103: (135:134)
125.(3x + 2) : 13 = 1000:13
125.(3x+2) = 1000:13.13
125.(3x+2) = 1000
3x + 2 = 1000:125
3x + 2 = 8
3x = 8 - 2
3x = 6
x = 6:3
x = 2
Bạn nhớ tick cho mình nhé!
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
x= 43
b) 2X-12=8
2X =8+12
2X=20
X=20:2
x =10
c)45:(3X-17)=32
45 : (3X-17)=9
3X-17=45:9
3X-17=5
3X=5+17
3X=22
x=22:3
x= 7,33
d)(2X-8)x2=24
( 2X-8)x2 =16
2X-8 =16:2
2X-8 =8
2X =8+8
2X =16
x =16:2
X =8
Đúng thì tk nếu sai thì thôi
Làm ẩu ^^
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Phép tính trên bằng: \(\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{2x+1}-\frac{1}{2x+3}\right)=\frac{1}{2}\left(\frac{1}{3}-\frac{1}{2x+3}\right)=\frac{x}{6x+9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a; \(\dfrac{2}{3}\)\(x\) - \(\dfrac{3}{2}\)\(x\) = \(\dfrac{5}{12}\)
(\(\dfrac{2}{3}\) - \(\dfrac{3}{2}\))\(x\) = \(\dfrac{5}{12}\)
- \(\dfrac{5}{6}\)\(x\) = \(\dfrac{5}{12}\)
\(x\) = \(\dfrac{5}{12}\) : (- \(\dfrac{5}{6}\))
\(x=\) - \(\dfrac{1}{2}\)
Vậy \(x=-\dfrac{1}{2}\)
b; \(\dfrac{2}{5}\) + \(\dfrac{3}{5}\).(3\(x\) - 3,7) = \(\dfrac{-53}{10}\)
\(\dfrac{3}{5}\).(3\(x\) - 3,7) = \(\dfrac{-53}{10}\) - \(\dfrac{2}{5}\)
\(\dfrac{3}{5}\).(3\(x\) - 3,7) = - \(\dfrac{57}{10}\)
3\(x\) - 3,7 = - \(\dfrac{57}{10}\) : \(\dfrac{3}{5}\)
3\(x\) - 3,7 = - \(\dfrac{19}{2}\)
3\(x\) = - \(\dfrac{19}{2}\) + 3,7
3\(x\) = - \(\dfrac{29}{5}\)
\(x\) = - \(\dfrac{29}{5}\) : 3
\(x\) = - \(\dfrac{29}{15}\)
Vậy \(x\) \(\in\) - \(\dfrac{29}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,3x-10=2x+13
\(\Rightarrow\)3x-2x=10+13
\(\Rightarrow\)x=23
b,x+12=-5-x
\(\Rightarrow\)x+x=-12-5
\(\Rightarrow\)2x=-17
\(\Rightarrow\)x=-8,5
c,x+5=10-x
\(\Rightarrow\)x+x=-5+10
\(\Rightarrow\)2x=5
\(\Rightarrow\)x=2,5
e,12-x=x+1
\(\Rightarrow\)-x-x=-12+1
\(\Rightarrow\)-2x=-11
\(\Rightarrow\)x=5,5
f,14+4x=3x+20
\(\Rightarrow\)4x-3x=-14+20
\(\Rightarrow\)x=6
g,2.(x-1)+3(x-2)=x-4
\(\Rightarrow\)2x-2+3x-6=x-4
\(\Rightarrow\)2x-2+3x-6-x+4=0
\(\Rightarrow\)4x-4=0
\(\Rightarrow\)4x=4
\(\Rightarrow\)x=1
h,3(4-x)-2(x-1)=x+20
\(\Rightarrow\)12-3x-2x+2-x-20=0
\(\Rightarrow\)-6x-6=0
\(\Rightarrow\)-6x=6
\(\Rightarrow\)x=-1
i,4(2x+7)-3(3x-2)=24
\(\Rightarrow\)8x+28-9x+6=24
\(\Rightarrow\)-x+34=24
\(\Rightarrow\)-x=-10
\(\Rightarrow\)x=10
k,3(x-2)+2x=10
\(\Rightarrow\)3x-6+2x=10
\(\Rightarrow\)5x-6=10
\(\Rightarrow\)5x=16
\(\Rightarrow\)x=3,2
Phần d, tớ không biết làm!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
bạn đã kiểm tra kĩ chưa vậy?mình đọc đề câu B mà loạn não luôn á;-;