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tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
Toán lớp 6Tìm x
Trả lời Câu hỏi tương tự
Chưa có ai trả lời câu hỏi này,bạn hãy là người đâu tiên giúp nguyenvanhoang giải bài toán này !
![](https://rs.olm.vn/images/avt/0.png?1311)
Đổi: 675km = 67 500 000cm
Trên bản đồ tỉ lệ 1:2 500 000 quãng đường dài là:
67 500 000 : 2 500 000 = 27 (cm)
Đáp số: 27 cm
Xin lỗi nha
![](https://rs.olm.vn/images/avt/0.png?1311)
k. \(\left(2x+\dfrac{3}{5}\right)\cdot2-\dfrac{9}{25}=0\\ \Leftrightarrow\left(2x+\dfrac{3}{5}\right)\cdot2=\dfrac{9}{25}\\ \Leftrightarrow2x+\dfrac{3}{5}=\dfrac{9}{50}\\ \Leftrightarrow2x=\dfrac{-21}{50}\\ \Leftrightarrow x=\dfrac{-21}{100}\)
l. \(3\left(3x-\dfrac{1}{2}\right)\cdot3+\dfrac{1}{9}=0\\ \Leftrightarrow\left(3x-\dfrac{1}{2}\right)\cdot9=-\dfrac{1}{9}\\ \Leftrightarrow3x-\dfrac{1}{2}=-\dfrac{1}{81}\\ \Leftrightarrow3x=\dfrac{79}{162}\\ \Leftrightarrow x=\dfrac{79}{486}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
câu1
(3x-1).(1/2x5)=0
=>3x-1=0 hoặc 1/2x5=0
=>x=1/3 =>x=0
câu2
1/4+1/3 :(2x-1)=5
=> 1/3:(2x-1)=19/4
=>2x-1 =57/4
=>2x=61/4
=>x=61/8
còn hai câu sau bn ghi đề mik ko hỉu
1.
a)(3x-1)(1/2x5)=0
=>3x-1=0 hoặc 1/2x5=0
3x=0+1 x=0:1/2:5
x=1/3 x=0
Vậy x=1/3 hoặc x=0
b)1/4+1/3:(2x-1)=5
1/3:(2x-1)=5-1/4=20/4-1/4=19/4
2x-1=1/3:19/4=1/3*4/19=4/57
2x=4/57+1=4/57+57/57=61/57
x=61/57:2=61/57*1/2=61/114
Vậy x=61/114
c)(2x+2/5)2-9/25=0=02-9/25
=>2x+2/5=0
2x=0-2/5
x=-2/5:2=-2/5*1/2
x=-1/5
Vậy x=-1/5
d)(3x-1/2)3+1/9=0=03+1/9
=>3x-1/2=0
3x=0+1/2
x=1/2:3=1/2*1/3
x=1/6
Vậy x=1/6
![](https://rs.olm.vn/images/avt/0.png?1311)
(2x+3/5)^2-9/25=0
<=> (2x+3/5)2 = 9/25
<=> 2x+3/5 = + 3/5
TH1 : 2x+3/5 = 3/5
<=> x =(3/5 -3/5 ) :2 =0
TH2 : 2x+3/5 = -3/5
<=> x = ( -3/5 -3/5) :2 = -3/5
3(3x-1)^3+1/9=0
<=> 3(3x-1)^3 = -1/9
<=> (3x-1)^3 = -1/9 :3 = -1/27
<=> 3x-1 = -1/3
<=> 3x = -1/3 +1 = 2/3
<=> x = 2/3 :3 =2/9
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
Để \(\left(3x-1\right).\left(-\frac{1}{2}x+5\right)=0\)=> 3x-1=0 hoặc \(-\frac{1}{2}x+5=0\)
=> x= \(\frac{1}{3}\) hoăc \(x=10\)
b)
\(\frac{1}{4}+\frac{1}{3}:\left(2x-1\right)=5\) => \(\frac{1}{3}:\left(2x-1\right)=5-\frac{1}{4}=\frac{19}{4}=>2x-1=\frac{1}{3}:\frac{19}{4}=\frac{4}{57}=>x=\frac{61}{114}\)
c) \(\left(2x+\frac{3}{5}\right)^2-\frac{9}{25}=0=>\left(2x+\frac{3}{5}\right)^2=\frac{9}{25}\)\(=>2x+\frac{3}{5}\in\left\{\pm\frac{3}{5}\right\}=>2x\in\left\{0;\frac{-6}{5}\right\}=>x\in\left\{0;\frac{-3}{5}\right\}\)
d) Xem lại đề
a) để (3x-1).(\(-\dfrac{1}{2}x+5\))=0
=> 3x-1 hoặc \(-\dfrac{1}{2}x+5\) =0
TH1 : 3x-1=0
3x = 0+1=1
x = 1:3 = \(\dfrac{1}{3}\)
TH2 : \(-\dfrac{1}{2}x+5\)= 0
\(-\dfrac{1}{2}x\)= 0 -5 = -5
x= -5 : \(-\dfrac{1}{2}\)
x= 10
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(2\left(x-\frac{1}{2}\right)^3-\frac{1}{4}=0\)
\(\left(x-\frac{1}{2}\right)^3=\frac{1}{8}\)
\(\left(x-\frac{1}{2}\right)^3=\left(\frac{1}{2}\right)^3\)
\(\Rightarrow x-\frac{1}{2}=\frac{1}{2}\)
\(\Rightarrow x=1\)
b)\(\left(3x-1\right)\left(5-\frac{1}{2}x\right)=0\)
\(\Rightarrow\orbr{\begin{cases}3x-1=0\\5-\frac{1}{2}x=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=\frac{1}{3}\\x=10\end{cases}}\)
c)\(\left(2n+\frac{3}{5}\right)^2-\frac{9}{25}=0\)
\(\left(2n+\frac{3}{5}\right)^2=\frac{9}{25}\)
\(\left(2n+\frac{3}{5}\right)^2=\left(\frac{3}{5}\right)^2=\left(-\frac{3}{5}\right)^2\)
\(\Rightarrow\hept{\begin{cases}2n+\frac{3}{5}=\frac{3}{5}\\2n+\frac{3}{5}=-\frac{3}{5}\end{cases}}\Rightarrow\hept{\begin{cases}n=0\\n=-\frac{3}{5}\end{cases}}\)
Vậy n=0;-3/5
d)\(3\left(3n-\frac{1}{2}\right)^3+\frac{1}{9}=0\)
\(\left(3n-\frac{1}{2}\right)^3=-\frac{1}{27}\)
\(\left(3n-\frac{1}{2}\right)^3=\left(-\frac{1}{3}\right)^3\)
\(3n-\frac{1}{2}=-\frac{1}{3}\)
\(\Rightarrow n=\frac{1}{18}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(2x+\frac{3}{5}\right)^2-\frac{9}{25}=0\)
\(\left(2x+\frac{3}{5}\right)^2=\frac{9}{25}\)
\(\left(2x+\frac{3}{5}\right)^2=\left(\frac{3}{5}\right)^2\)
\(=>2x+\frac{3}{5}=\frac{3}{5}\)
\(2x=\frac{3}{5}-\frac{3}{5}\)
\(2x=0\)
\(x=0:2\)
\(x=0\)
b) \(\left(3x-1\right).\left(-\frac{1}{2x}+5\right)=0\)
=> \(\left(3x-1\right)=0\)hoặc \(\left(-\frac{1}{2x}+5\right)=0\)hoặc \(\left(3x-1\right)\)và\(\left(-\frac{1}{2x}+5\right)\)cùng bằng 0.
\(\orbr{\begin{cases}3x-1=0\\-\frac{1}{2x}+5=0\end{cases}}=>\orbr{\begin{cases}3x=1\\-\frac{1}{2x}=-5\end{cases}}=>\orbr{\begin{cases}x\in\varnothing\\2x=\frac{1}{5}\end{cases}}=>x=\frac{1}{5}:2=>x=\frac{1}{10}\)