![](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)
c,Dãy trên có số số hạng là:
(52-2):2+1=26 số hạng
Tổng của dãy trên là:
(52+2).26:2=702
Đáp số :.....
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3\frac{1}{5}h\cdot2\frac{1}{4}\)
\(=\frac{16}{5}h\cdot\frac{9}{4}\)
\(=7h12'\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{17}{15}:x=\frac{11}{3}-\frac{5}{2}\)
\(\frac{17}{5}:x=\frac{22}{6}-\frac{15}{6}\)
\(\frac{17}{5}:x=\frac{7}{6}\)
\(x=\frac{17}{5}:\frac{7}{6}\)
\(x=\frac{17}{5}.\frac{6}{7}\)
\(x=\frac{102}{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)12 x 18 + 14 x 3 - 255 : 17=25.58823529411765
b)68 + 42 x 5 - 625 : 25=5182
c) 13+ 21 x 5 - (198 : 11 - 8)=108
d) 1188 - 4 x (27 + 90 + 73 :10 )=
e) 5 + 8 + 11 + 14 +......+ 38 + 41=
f) 51 - 49 + 55 - 53 + 59 - 56 + 63 - 61 + 65=74
có mấy câu mình ko biết,xin lỗi bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
(1-1/2) x (1-1/3) x .... x (1-1/100)
= 1/2 x 2/3 x ... x 99/100
= 1x2x...x99/2x3x..x100
= 1/ 100
a, \(\frac{3}{5}+25-\frac{1}{5}\)
\(=\left(\frac{3}{5}-\frac{1}{5}\right)+25\)
\(=\frac{2}{5}+25\)
\(=25\frac{2}{5}\)
\(=25,4\)
b, \(13.3.32,27+67,63.39\)
\(=39.32,27+67,63.39\)
\(=39\left(32,37+67,63\right)\)
\(=39.100\)
\(=3900\)
c, \(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right)....\left(1-\frac{1}{100}\right)\)
\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}......\frac{99}{100}\)
\(=\frac{1}{100}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\times9,6+x:2,5=45\\ x\times9,6+x\times0,4=45\\ x\times\left(9,6+0,4\right)=45\\ x\times10=45\\ x=45:10\\ x=4,5\)
\(x\times13\frac{1}{3}=\left(x+25\right)\times12\frac{1}{2}\)
\(\Rightarrow x\times\frac{40}{3}=x\times12\frac{1}{2}+25\times12\frac{1}{2}\)
\(\Rightarrow x\times\frac{40}{3}=x\times\frac{25}{2}+25\times\frac{25}{2}\)
\(\Rightarrow x\times\frac{40}{3}=x\times\frac{25}{2}+\frac{625}{2}\)
\(\Rightarrow x\times\frac{40}{3}-x\times\frac{25}{2}=\frac{625}{2}\)
\(\Rightarrow x\times\left(\frac{40}{3}-\frac{25}{2}\right)=\frac{625}{2}\)
\(\Rightarrow x\times\frac{5}{6}=\frac{625}{2}\Rightarrow x=\frac{625}{2}:\frac{5}{6}=\frac{625}{2}\cdot\frac{6}{5}=375\)
Vậy x = 375