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\(\frac{1}{18}+\frac{1}{54}+\frac{1}{108}+...+\frac{1}{504}\)
\(=\frac{1}{3.6}+\frac{1}{6.9}+\frac{1}{9.12}+...+\frac{1}{21.24}\)
\(=\frac{1}{3}.\left(\frac{3}{3.6}+\frac{3}{6.9}+\frac{3}{9.12}+...+\frac{3}{21.24}\right)\)
\(=\frac{1}{3}.\left(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}+...+\frac{1}{21}-\frac{1}{24}\right)\)
\(=\frac{1}{3}.\left(\frac{1}{3}-\frac{1}{24}\right)\)
\(=\frac{1}{3}.\frac{7}{24}\)
\(=\frac{7}{72}\)
_Chúc bạn học tốt_
=>\(\frac{1}{3.6}+\frac{1}{6.9}+\frac{1}{9.12}+...+\frac{1}{21.24}\)
=>\(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}+...+\frac{1}{21}-\frac{1}{24}\)
=> \(\frac{1}{3}-\frac{1}{24}\)\(=\frac{7}{24}\)
Quy đông 13/12=13*18/12*18=234/216 rút gọn =13/12
Quy đồng 19/18 =19*12/18*12=228/216 rút gọn =19/18
Xin hay nhất ><
\(\dfrac{7}{6}\) + \(\dfrac{5}{12}\) - \(\dfrac{1}{18}\) - 1
= \(\dfrac{42}{36}\) + \(\dfrac{15}{36}\) - \(\dfrac{2}{36}\) - \(\dfrac{36}{36}\)
= \(\dfrac{19}{36}\)
\(\dfrac{13}{6}\) + \(\dfrac{5}{18}+3-\dfrac{7}{12}\)
= \(\dfrac{78}{36}+\dfrac{10}{36}+\dfrac{108}{36}-\dfrac{21}{36}\)
= \(\dfrac{175}{36}\)
3 + \(\dfrac{11}{4}-\dfrac{1}{12}-\dfrac{3}{16}\)
= \(\dfrac{144}{48}+\dfrac{132}{48}-\dfrac{4}{48}-\dfrac{9}{48}\)
= \(\dfrac{263}{48}\)
\(\dfrac{2}{5}\) x \(\dfrac{7}{4}\) - \(\dfrac{2}{5}\) x \(\dfrac{3}{4}\)
= \(\dfrac{2}{5}\) x ( \(\dfrac{7}{4}\) - \(\dfrac{3}{4}\))
= \(\dfrac{2}{5}\) x \(\dfrac{4}{4}\)
= \(\dfrac{2}{5}\)
\(\dfrac{108}{504}=\dfrac{3}{14}\) ( cùng chia tử mẫu cho 36)
108/ 504= 108: 36/ 504: 36= 3/14
chúc bạn học tốt
đúng tick cho mik nhen
35/46:(35/17+3/18)
35/46:227/102
35/46×102/227
1785/5221
504:18=28
Hok tốt
kết quả bằng 28 nhé