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format('truetype')%3Bfont-weight%3Anormal%3Bfont-style%3Anormal%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Cline%20stroke%3D%22%23000000%22%20stroke-linecap%3D%22square%22%20stroke-width%3D%221%22%20x1%3D%222.5%22%20x2%3D%2218.5%22%20y1%3D%225.5%22%20y2%3D%223.5%22%2F%3E%3Cline%20stroke%3D%22%23000000%22%20stroke-linecap%3D%22square%22%20stroke-width%3D%221%22%20x1%3D%2218.5%22%20x2%3D%2234.5%22%20y1%3D%223.5%22%20y2%3D%225.5%22%2F%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%225.5%22%20y%3D%2219%22%3EA%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%2217.5%22%20y%3D%2219%22%3EO%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%2228.5%22%20y%3D%2219%22%3EB%3C%2Ftext%3E%3Ctext%20font-family%3D%22math123919e9c7f188e0f3ae690e7e2%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2243.5%22%20y%3D%2219%22%3E%3D%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2261.5%22%20y%3D%2219%22%3E80%3C%2Ftext%3E%3Ctext%20font-family%3D%22math123919e9c7f188e0f3ae690e7e2%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2274.5%22%20y%3D%2219%22%3E%26%23xB0%3B%3C%2Ftext%3E%3C%2Fsvg%3E)
, tia OC nằm giữa hai tia OA và OB sao cho format('truetype')%3Bfont-weight%3Anormal%3Bfont-style%3Anormal%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Cline%20stroke%3D%22%23000000%22%20stroke-linecap%3D%22square%22%20stroke-width%3D%221%22%20x1%3D%222.5%22%20x2%3D%2218.5%22%20y1%3D%225.5%22%20y2%3D%223.5%22%2F%3E%3Cline%20stroke%3D%22%23000000%22%20stroke-linecap%3D%22square%22%20stroke-width%3D%221%22%20x1%3D%2218.5%22%20x2%3D%2234.5%22%20y1%3D%223.5%22%20y2%3D%225.5%22%2F%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%225.5%22%20y%3D%2219%22%3EA%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%2217.5%22%20y%3D%2219%22%3EO%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%2229.5%22%20y%3D%2219%22%3EC%3C%2Ftext%3E%3Ctext%20font-family%3D%22math123919e9c7f188e0f3ae690e7e2%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2244.5%22%20y%3D%2219%22%3E%3D%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2262.5%22%20y%3D%2219%22%3E54%3C%2Ftext%3E%3Ctext%20font-family%3D%22math123919e9c7f188e0f3ae690e7e2%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2275.5%22%20y%3D%2219%22%3E%26%23xB0%3B%3C%2Ftext%3E%3C%2Fsvg%3E)
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. Tính 
<Hình bạn tự vẽ nha :) >
a) Vì tia OC nằm giữa OA và OB nên
\(\widehat{AOB}=\widehat{AOC}+\widehat{COB}\)
\(\Rightarrow\widehat{COB}=\widehat{AOB}-\widehat{AOC}\)
\(\Leftrightarrow\widehat{COB}=80^o-54^o=26^o\)
b) OC là tia phân giác \(\widehat{AOD}\)nên\(\widehat{COA}=\widehat{COD}=54^o\)
Vậy \(\widehat{AOD}=\widehat{COA}+\widehat{COD}=54^o+54^o=108^o\)
Ta có: \(\widehat{DOB}=\widehat{COD}-\widehat{COB}=54^o-26^o=28^o\)
\(\dfrac{22}{5\times9}+\dfrac{22}{9\times13}+\dfrac{22}{13\times17}+\dfrac{22}{17\times21}+\dfrac{22}{21\times25}\\ =\dfrac{2}{11}\times\left(\dfrac{4}{5\times9}+\dfrac{4}{9\times13}+\dfrac{4}{13\times17}+\dfrac{4}{17\times21}+\dfrac{4}{21\times25}\right)\\ =\dfrac{2}{11}\times\left(\dfrac{1}{5}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{13}+\dfrac{1}{13}-\dfrac{1}{17}+\dfrac{1}{17}-\dfrac{1}{21}+\dfrac{1}{21}-\dfrac{1}{25}\right)\\ =\dfrac{2}{11}\times\left(\dfrac{1}{5}-\dfrac{1}{25}\right)\\ =\dfrac{2}{11}\times\dfrac{5-1}{25}\\ =\dfrac{2}{11}\times\dfrac{4}{25}=\dfrac{8}{275}\)
100960/22 = 50480/11
cho mình nhé chúc bạn học tốt