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![](https://rs.olm.vn/images/avt/0.png?1311)
0,5x-2/3x=7/12
=>(1/2-2/3).x=7/12
=>-1/6x=7/12
=>x=7/12:1/6
=>x=7/2
b, x:4 1/3=-2,5
=>x:13/3=-2,5
=>x=-5/2x13/3
=>x=-13
c,5,5x=13/15
=>11/2x=13/15
=>x=13/15:11/2
=>x=26/165
d,(3x/7+1):-4=-1/28
=>3x/7+1=-1/28x(-4)
=>3x/7+1=-1/7
=>3x/7=-1/7-1
=>3x/7=-8/7
=>3x=-8/7x7
=>3x=8
=>x=8:3
=>x=8/3
\(0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\left(\frac{1}{2}-\frac{2}{3}\right)x=\frac{7}{12}\)
\(\frac{-1}{6}x=\frac{7}{12}\)
\(x=-21\)
b,c,d tương tự
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(0,5-\frac{2}{3}\right)\cdot x=\frac{7}{12}\)
\(\left(\frac{1}{2}-\frac{2}{3}\right)\cdot x=\frac{7}{12}\)
\(\frac{-1}{6}\cdot x=\frac{7}{12}\)
\(x=\frac{7}{12}:\frac{-1}{6}\)
\(x=\frac{7}{12}\cdot\frac{-6}{1}\)
\(x=\frac{-7}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)x(1/2-2/3)=7/12
x.(-1/6)=7/12
x=7/12 / (-1/6)
x=-7/2
b)x=13/15 / 5,5
x=26/165
c)3x/7 + 1=-1/28.(-4)
3x/7 + 1=1/7
3x/7=1/7-1=-6/7
3x=-6/7.7=-6
x=-6:3=-2
![](https://rs.olm.vn/images/avt/0.png?1311)
a. \(0,5x-\frac{2}{3}x=\frac{7}{12}\)
=>\(\left(0,5-\frac{2}{3}\right).x=\frac{7}{12}\)
=>\(-\frac{1}{6}.x=\frac{7}{12}\)
=>\(x=\frac{7}{12}:-\frac{1}{6}=-\frac{7}{2}\)
_Hok tốt_
b.\(x:4\frac{1}{3}=-2,5\)
=>\(x:\frac{13}{3}=-2,5\)
=>\(x=-2,5.\frac{13}{3}=-\frac{65}{6}\)
_Hok tốt_
![](https://rs.olm.vn/images/avt/0.png?1311)
A)X.(0,5-2/3)=7/12
X.(-1/6)=7/12
X=7/12chia(-1/6)
X=11/3
B)X=-2,5.4/1/3=-26/15
C)X=13/15chia 5,5=26/165
D)X=[3x/7+1]=(-1)/28.(-4)
X=[3x/7+1]=1/112
X=1/112-1
X=-111/112
X=-111/112.3x/7
X=-333/784
a) \(0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(-\frac{1}{6}x=\frac{7}{12}\)
\(x=\frac{7}{12}:\left(-\frac{1}{6}\right)\)
\(x=-\frac{7}{2}\)
b) \(x:4\frac{1}{3}=-2,5\)
\(x=-2,5\)x \(4\frac{1}{3}\)
\(x=-\frac{65}{6}\)
c) \(5,5x=\frac{13}{15}\)
\(x=\frac{13}{15}:5,5\)
\(x=\frac{26}{165}\)
d)\(\left[\frac{3x}{7}+1\right]:\left(-4\right)=\frac{-1}{28}\)
\(\frac{3x}{7}+1=\left(\frac{-1}{28}\right)\)x\(\left(-4\right)\)
\(\frac{3x}{7}+1=\frac{1}{7}\)
\(3x:7=\frac{1}{7}-1\)
\(3x:7=-\frac{6}{7}\)
\(3x=\left(-\frac{6}{7}\right)\)x \(7\)
\(3x=-6\)
\(x=-2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
X+30/100X=-1,3
X+3/10X=-1,3
X.13/10=-13/10
X=-1
(3/7X+1):(-4)=-1/28
3/7X+1=1/7
3/7X=-6/7
X=-2
0,5X-2/3X=7/12
1/2X-2/3X=7/12
X.-1/6=7/12
X=5/12
Nhớ k đấy cha=))Con lớp 6 thấy mấy câu này dễ kinh
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x-40\%x=3,6\)
\(\Rightarrow100\%x-40\%x=3,6\)
\(\Rightarrow60\%x=3,6\)
\(\Rightarrow\frac{60}{100}x=3,6\)
\(\Rightarrow x=6\)
\(3\frac{2}{7}x-\frac{1}{3}=-2\frac{3}{4}\)
\(\Rightarrow\frac{23}{7}x-\frac{1}{3}=-\frac{11}{4}\)
\(\Rightarrow\frac{23}{7}x=-\frac{33}{12}+\frac{4}{12}\)
\(\Rightarrow\frac{23}{7}x=\frac{29}{12}\)
\(\Rightarrow x=\frac{29}{12}:\frac{23}{7}=\frac{203}{276}\)