![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{\left(-11\right)^5.13^7}{11^5.13^8}=\frac{\left(-11\right)^5.13^7}{11^5.13^7}.\frac{1}{13}=-1.\frac{1}{13}=-\frac{1}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\frac{2929-101}{2.1919+404}\)
\(B=\frac{29.101-101}{38.101+4.101}\)
\(B=\frac{101.\left(29-1\right)}{101.\left(38+4\right)}\)
\(B=\frac{2}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Để phân số sau rút gọn được thì n - 1 phải chia hết cho n + 8
2n + 16 chia hết cho n - 1
=> 2n - 2 + 18 chia hết cho n -1
=> 2(n-1) + 18 chia hết cho n - 1
Vì 2(n-1) chia hết cho n - 1 nên 18 chia hết cho n-1
Hay n - 1 \(\in\)Ư(18)
Ư(18) = { 1,2,3,6,18,-1,-2,-3,-6,-18}
Lập bảng ra
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\frac{16\left(18-7\right)}{33\left(15+1\right)}=\frac{16\cdot11}{16\cdot33}=\frac{1}{3}\)
\(\frac{16.18-16.17}{15.33+33}\)
\(=\frac{16\left(18-17\right)}{33\left(15+1\right)}\)
\(=\frac{16.1}{33.16}\)
\(=\frac{1}{33}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{15.8+15.4}{12.3}=\frac{15.\left(8+4\right)}{12.3}=\frac{15.12}{12.3}=\frac{5}{1}=5\)
\(\frac{15.8+15.4}{12.3}=\frac{15.\left(8+4\right)}{12.3}=\frac{5.12}{4.3}=\frac{5}{1}=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tờ làm luôn, ko ghi đề nữa nhé
\(A=\frac{\frac{24}{12}-\frac{4}{12}+\frac{3}{12}}{\frac{24}{12}+\frac{2}{12}-\frac{3}{12}}\)
\(A=\frac{\frac{23}{12}}{\frac{23}{12}}=1\)
Vậy A=1
\(A=\frac{2-\frac{1}{3}+\frac{1}{4}}{2+\frac{1}{6}-\frac{1}{4}}\)\(=\frac{2-\frac{2}{6}+\frac{2}{8}}{2+\frac{2}{12}-\frac{2}{8}}\)\(=\frac{2\left(1-\frac{1}{6}+\frac{1}{8}\right)}{-2\left(1-\frac{1}{12}+\frac{1}{8}\right)}\)\(=-1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{199.......9}{999.......5}=\frac{199.......9:199.......9}{999.......5:199........9}=\frac{1}{5}\)
\(\frac{121212}{424242}=\frac{121212:10101}{424242:10101}=\frac{12}{42}\)
\(\frac{187187187}{221221221}=\frac{187187187:1001001}{221221221:1001001}=\frac{187}{221}\)
\(\frac{20082008}{20112011}=\frac{20082008:10001}{20112011:10001}=\frac{2008}{2011}\)
\(\frac{199...9}{99...95}\)=\(\frac{199...9:199...9}{99...95:199...9}\)\(\frac{\left(20so9\right)}{\left(20so9\right)}\)
=\(\frac{1}{5}\)
cùng chia cả tử và mẫu cho 10638 đc p/s \(\frac{3}{4}\)
\(\frac{31914}{42552}=\frac{31914\div10638}{42552\div10638}=\frac{3}{4}\)