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![](https://rs.olm.vn/images/avt/0.png?1311)
a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 1/5 = 4/7 + 2/7 x - 3521 = 21352 : 34
x : 1/5 = 6/7 x - 3521 = 628
x= 6/7 x 1/5 x = 628 + 3521
x = 6/35 x = 4149
nho k cho mk nhe
x:1/5=4/7+2/7
x:1/5=6/7
x=6/7.1/5
x=6/35
x-3521=21352:34
x-3521=628
x=628+3512
x=4140
k chắc cho lắm :D
![](https://rs.olm.vn/images/avt/0.png?1311)
A, X x 3/5 + X x 7/5 = 9/4 B, X - 4/7 = 1/5 : 7/2
<=> X x (3/5 + 7/5) = 9/4 <=> X - 4/7 = 2/35
<=> X x 2 = 9/4 <=> X = 2/35 + 4/7 <=> X = 22/35
<=> X= 9/4 : 2 <=> X = 9/8
#HT#
\(a,x.\frac{3}{5}+x.\frac{7}{5}=\frac{9}{4}\)
\(\Leftrightarrow x.\left(\frac{3}{5}+\frac{7}{5}\right)=\frac{9}{4}\)
\(\Leftrightarrow x.2=\frac{9}{4}\)
\(\Leftrightarrow x=\frac{9}{8}\)
\(b,x-\frac{4}{7}=\frac{1}{5}:\frac{7}{2}\)
\(\Leftrightarrow x-\frac{4}{7}=\frac{2}{35}\)
\(\Leftrightarrow x=\frac{22}{35}\)
a) x:1/5=5/7 b)7/4 - x= 7/9
x=5/7x1/5 x=7/4 -7/9
x=1/7 x= 35/36