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\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}\times\frac{5}{4}\)
\(=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{27+25}{36}=\frac{52}{36}=\frac{13}{9}\)
\(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)\)
\(=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Giải:
18/11+8/8+19/13
=1872+1144+1672/1144
=4688/1144
=586/143
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![](https://rs.olm.vn/images/avt/0.png?1311)
x x 3/4 = 11/7 : 3/2
x x 3/4 = 22/21
x = 22/21 :3/4
x = 88/63
![](https://rs.olm.vn/images/avt/0.png?1311)
3/5+6/11+7/13+2/5+6/11+19/3
= (3/5+2/5)+(6/11+6/11)+7/13+19/3
= 1 + 12/11 + 7/13+19/3
= 23/11 + 7/13+19/3
= 23/11 + 268/39
= 3845/429
TL
1 7/19 x 8/11=56/209
2 3/11x 7/192=7/704
nhé
HT