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sorry mk trả lời lại nè\(\dfrac{15\cdot\left(\dfrac{1}{6\cdot16}+\dfrac{1}{16\cdot26}+\dfrac{1}{26\cdot36}\right)}{33\cdot\left(\dfrac{1}{6\cdot16}+\dfrac{1}{16\cdot26}+\dfrac{1}{26\cdot36}\right)}=\dfrac{15}{33}\)
\(\dfrac{33}{6.16}\)-\(\dfrac{63}{16.26}\)+\(\dfrac{93}{26.36}\)
=\(\dfrac{3.11}{3.2.16}\)-\(\dfrac{3.21}{13.2.16}\)+\(\dfrac{93}{26.36}\)
=\(\dfrac{1}{2.16}\).11+\(\dfrac{1}{2.16}\).\(\dfrac{3.21}{13}\)+\(\dfrac{93}{26.36}\)
=\(\dfrac{1}{32}\).\(\dfrac{143-63}{13}\)+\(\dfrac{31.3}{26.36}\)
=\(\dfrac{1}{32}\).\(\dfrac{143-63}{13}\)+\(\dfrac{31.3}{26.3.12}\)
=\(\dfrac{1}{32}\).\(\dfrac{80}{13}\)+\(\dfrac{31}{36.12}\)
=\(\dfrac{5}{26}\)+\(\dfrac{31}{26.12}\)
=\(\dfrac{60+31}{26.12}\)
=\(\dfrac{91}{26.12}\)
=\(\dfrac{13.7}{13.2.12}\)
=\(\dfrac{7}{24}\)
\(\Rightarrow B=\frac{\frac{3}{2}.\left(\frac{1}{6}-\frac{1}{16}+\frac{1}{16}-\frac{1}{26}+\frac{1}{26}-\frac{1}{36}\right)}{\frac{33}{10}.\left(\frac{1}{6}-\frac{1}{16}+\frac{1}{16}-\frac{1}{26}+\frac{1}{26}-\frac{1}{36}\right)}=\frac{\frac{3}{2}}{\frac{33}{10}}=\frac{3}{2}:\frac{33}{10}=\frac{5}{11}\)
\(\frac{15.\left(\frac{1}{616}.\frac{1}{6.16}.\frac{1}{6.16}\right)}{33.\left(\frac{1}{6.16}.\frac{1}{6.16}.\frac{1}{6.16}\right)}=\frac{15}{35}\)