36/41:9/41 phần14/21:7/21 x2/5
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\(\frac{\left(\frac{36}{41}:\frac{9}{41}\right)}{\left(\frac{14}{21}:\frac{7}{21}\right)}\times\frac{2}{5}\)
\(=\frac{\left(\frac{36}{41}\times\frac{41}{9}\right)}{\left(\frac{14}{21}\times\frac{21}{7}\right)}\times\frac{2}{5}\)
\(=\frac{4}{2}\times\frac{2}{5}\)
\(=\frac{4}{5}\)
~ Ủng hộ nhé
\(\frac{\text{36/41 : 9/41 }}{\text{14/21: 7/21}}\)= \(\frac{4}{2}\)= 2 => 2 x \(\frac{2}{5}\)= \(\frac{4}{5}\)
a)[(\(\frac{36}{41}\): \(\frac{9}{41}\)) : (\(\frac{14}{21}\):\(\frac{7}{21}\)) x \(\frac{2}{5}\)]
=[ 4 : 2 x \(\frac{2}{5}\)]
=\(\frac{4}{5}\)
b) (\(\frac{1}{2}\)- \(\frac{1}{4}\)+\(\frac{1}{5}\)) : (\(\frac{1}{2}\)+ \(\frac{1}{4}\)'- \(\frac{1}{5}\))
=\(\frac{9}{20}\): \(\frac{11}{20}\)
=\(\frac{9}{11}\)
( Mình tính luôn cho nó nhanh phần cuối cùng nhá)
=\(\frac{4}{5}\): \(\frac{3}{5}\)
=\(\frac{4}{3}\)
\(\frac{5}{11.16}+\frac{5}{16.21}+..+\frac{5}{36.41}\)
\(=\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+..+\frac{1}{36}-\frac{1}{41}\)
\(=\frac{1}{11}-\frac{1}{41}\)
= bn tự timnhs nha......................................
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\(\frac{5}{11.16}+\frac{5}{16.21}+...+\frac{5}{36.41}\)
\(=\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+...+\frac{1}{36}-\frac{1}{41}\)
\(=\frac{1}{11}-\frac{1}{41}\)
\(=\frac{30}{451}\)
_Chúc bạn học tốt_
\(-\dfrac{5}{7}\left(\dfrac{-19}{41}+-\dfrac{21}{41}+1\right)=-\dfrac{5}{7}.\dfrac{1}{41}=-\dfrac{5}{287}\)
\(=\dfrac{-5}{7}\left(\dfrac{19}{41}+\dfrac{21}{41}-1\right)=\dfrac{-5}{7}\cdot\dfrac{-1}{41}=\dfrac{5}{287}\)
5.\(-\dfrac{3}{7}+\dfrac{5}{13}+\dfrac{-4}{12}=-\dfrac{103}{273}\)
b.\(-\dfrac{5}{21}+\dfrac{-2}{21}+\dfrac{8}{24}=\dfrac{-5-2}{21}+\dfrac{8}{24}=-\dfrac{7}{21}+\dfrac{8}{24}=-\dfrac{1}{3}+\dfrac{8}{24}=0\)
c.\(\dfrac{5}{13}+\dfrac{-5}{7}+\dfrac{-20}{41}+\dfrac{8}{13}+\dfrac{-21}{41}=\left(\dfrac{5}{13}+\dfrac{8}{13}\right)+\left(\dfrac{-20}{41}+\dfrac{-21}{41}\right)+-\dfrac{5}{7}=1-1-\dfrac{5}{7}=-\dfrac{5}{7}\)
1: =5/13+8/13-20/41-21/41-5/17
=1-1-5/17=-5/17
2: =1/5+4/5-2/9-7/9+16/17
=16/17+1-1=16/17
3: =1/3-1/5+1/5-1/7+...+1/99-1/101
=1/3-1/101
=98/303
=5
\(\dfrac{\dfrac{36}{41}:\dfrac{9}{41}}{\dfrac{14}{21}:\dfrac{7}{21}}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{\dfrac{36}{41}\times\dfrac{41}{9}}{\dfrac{14}{21}\times\dfrac{21}{7}}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{4}{2}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{4}{5}\)