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a: 7/8>210/243
b: 11/15<13/14
c: 31/41<313/413
d: 18/53<26/78
b/ =-36.16+36.41-16.41+16.36
=36.41-16.41
=41.(36-16)
=41.20
=820
\(\dfrac{55}{11}\cdot6+\dfrac{55}{16}\cdot21+\dfrac{55}{21}\cdot26+\dfrac{55}{26}\cdot31+\dfrac{55}{31}\cdot36+\dfrac{55}{36}\cdot41=30+\dfrac{1155}{16}+\dfrac{1430}{21}+\dfrac{1705}{26}+\dfrac{1980}{31}+\dfrac{2255}{36}=\dfrac{12186720}{406224}+\dfrac{29324295}{406224}+\dfrac{27661920}{406224}+\dfrac{26638920}{406224}+\dfrac{25945920}{406224}+\dfrac{25445420}{406224}=\dfrac{147203195}{406224}\)
\(\frac{5}{11.16}+\frac{5}{16.21}+..+\frac{5}{36.41}\)
\(=\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+..+\frac{1}{36}-\frac{1}{41}\)
\(=\frac{1}{11}-\frac{1}{41}\)
= bn tự timnhs nha......................................
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\(\frac{5}{11.16}+\frac{5}{16.21}+...+\frac{5}{36.41}\)
\(=\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+...+\frac{1}{36}-\frac{1}{41}\)
\(=\frac{1}{11}-\frac{1}{41}\)
\(=\frac{30}{451}\)
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Bằng 0
\(\dfrac{13}{31}\) - ( \(\dfrac{15}{41}\) - \(\dfrac{18}{31}\)) - \(\dfrac{26}{41}\)
= \(\dfrac{13}{31}\) - \(\dfrac{15}{41}\) + \(\dfrac{18}{31}\) - \(\dfrac{26}{41}\)
= (\(\dfrac{13}{31}\) + \(\dfrac{18}{31}\)) - ( \(\dfrac{15}{41}\) + \(\dfrac{26}{41}\))
= \(\dfrac{31}{31}\) - \(\dfrac{41}{41}\)
= 1 - 1
= 0