\(\frac{45x16-17}{45x15-28}\)\(=\frac{703}{647}\)

Tích tớ nha

ai truoc minh cho

Mk chắc chắn đề bài của bn sai, ở mẫu phải là + 28

\(\frac{45x16-17}{45x15+28}=\frac{45x15+45-17}{45x15+28}=\frac{45x15+\left(45-17\right)}{45x15+28}=\frac{45x15+28}{45x15+28}\)

Ủng hộ mk nha ^_-

1153/703 nha bn

\(\frac{45\times16-17}{45\times15+28}=\frac{45\times15+45-17}{45\times15+28}=\frac{45\times15+28}{45\times15+28}=1\)

1 nhé bạn

15.(45-17/45)+28             ,       15.2008/45+28           2008/3+28            2092/3

cho mình nhé

2092/3

phaỉ giải chi tiết chứ nói như nguyentuantai thì bấm áy tính cũng ra thôi!

\(\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+\frac{1}{45}\)

\(=2\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)

\(=2\left(\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+\frac{1}{6\cdot7}+\frac{1}{7\cdot8}+\frac{1}{8\cdot9}+\frac{1}{9\cdot10}\right)\)

\(=2\left(\left[\frac{1}{3}-\frac{1}{4}\right]+\left[\frac{1}{4}-\frac{1}{5}\right]+\left[\frac{1}{5}-\frac{1}{6}\right]+\left[\frac{1}{6}-\frac{1}{7}\right]+\left[\frac{1}{7}-\frac{1}{8}\right]+\left[\frac{1}{8}-\frac{1}{9}\right]+\left[\frac{1}{9}-\frac{1}{10}\right]\right)\)

\(=2\left(\frac{1}{3}-\frac{1}{10}\right)\)

\(=2\cdot\frac{7}{30}\)

\(=\frac{7}{15}\)

\(I=\frac{\frac{25}{17}-\frac{25}{27}-\frac{25}{37}-\frac{25}{47}}{\frac{45}{17}-\frac{45}{27}-\frac{45}{37}-\frac{45}{47}}\)

\(I=\frac{25.\left(\frac{1}{17}-\frac{1}{27}-\frac{1}{37}-\frac{1}{47}\right)}{45.\left(\frac{1}{17}-\frac{1}{27}-\frac{1}{37}-\frac{1}{47}\right)}\)

\(I=\frac{25}{45}=\frac{5}{9}\)

2227/3

Băng 1 nha ban

45x15+45-17=45x15+28=1

45x15+28        45x15+28