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![](https://rs.olm.vn/images/avt/0.png?1311)
Rút gọn tử số và mẫu số, ta được:
1.1+1.1+1.1/3.3+3.3+3.3
=1.3/9.3
Rút gọn 3 trên tử với 3 dưới mẫu
Vậy A=1/9
Tick nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
A = \(\frac{7.9+2.7.3.9-3.7.4.9}{3.7.3.9+2.3.7.9.9+7.9.4.3.9}\)
= \(\frac{7.9.\left(1+6-12\right)}{3.7.9.\left(3+18+36\right)}=\frac{-5}{3.57}=\frac{-5}{171}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:A=\(\frac{7.9.\left(1+2.3+3.4\right)}{21.27.\left(1+2.3+3.4\right)}=\frac{7.9}{21.27}=\frac{1}{9}\)
Vậy A=\(\frac{1}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
\(=\frac{7.9+14.27+21.36}{7.3.9.3+14.3.27.3+21.3.36.3}\)
\(=\frac{7.9+14.27+21.36}{\left(.9+14.27+21.36\right).3.3}\)
\(=\frac{7.9+14.27+21.36}{\left(7.9+14.27+21.36\right).9}\)
\(=\frac{1}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
ta có:
7.9+14.27+21.36/21.27+42.81+63.108=1/9
Đúng thì like cho mình nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
A = \(\dfrac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
= \(\dfrac{7.9+7.2.9.3+7.3.9.4}{21.27+21.2.27.3+21.3.27.4}\)
= \(\dfrac{\left(7.9\right)\left(2.3+3.4\right)}{\left(21.27\right)\left(2.3+.3.4\right)}\)
= \(\dfrac{1}{9}\)
@Nguyễn Ngọc Gia Hân
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
\(A=\frac{7.9+7.2.27+7.3.36}{7.3.27+7.6.81+7.9.108}\)
\(A=\frac{7.9+7.54+7.108}{7.81+7.486+7.972}\)
\(A=\frac{7.\left(9+54+108\right)}{7.\left(81+486+972\right)}\)
\(A=\frac{7.171}{7.1539}=\frac{171}{1539}=\frac{1}{9}\)