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sorry mk trả lời lại nè\(\dfrac{15\cdot\left(\dfrac{1}{6\cdot16}+\dfrac{1}{16\cdot26}+\dfrac{1}{26\cdot36}\right)}{33\cdot\left(\dfrac{1}{6\cdot16}+\dfrac{1}{16\cdot26}+\dfrac{1}{26\cdot36}\right)}=\dfrac{15}{33}\)
Ta có:\(A=\frac{\frac{15}{6.16}+\frac{15}{16.26}+\frac{15}{26.36}}{\frac{33}{6.16}+\frac{63}{16.26}+\frac{93}{26.36}}\)
=>\(A=\frac{\left(\frac{1}{6.16}+\frac{1}{16.26}+\frac{1}{26.36}\right).15}{\frac{33}{6.16}+\frac{\frac{21}{11}.33}{16.26}+\frac{\frac{31}{11}.33}{26.36}}\)
=>\(A=\frac{\left(\frac{1}{6.16}+\frac{1}{16.26}+\frac{1}{26.36}\right).15}{\frac{21}{11}.\frac{31}{11}.33.\left(\frac{1}{6.16}+\frac{1}{16.26}+\frac{1}{26.36}\right)}\)
=>\(A=\frac{15}{\frac{21}{11}.\frac{31}{11}.33}\)
=>\(A=\frac{15}{\frac{1953}{11}}\)
=>\(A=\frac{55}{651}\)
Vậy \(A=\frac{55}{651}\)
bạn tính theo sai phân hữu hạng ý.rút tử ra ngoai để mẫu là 1
\(\frac{\frac{15+15+15}{6\cdot32}}{\frac{33+63+93}{6\cdot32}}=\frac{\frac{45}{216}}{\frac{63}{216}}=\frac{45}{63}=\frac{5}{7}\)
(tử mẩu đều có số giống nhau thì gạch nha)
\(=\frac{33\cdot26\cdot36-63\cdot6\cdot36+93\cdot6\cdot16}{6\cdot16\cdot26\cdot36}\)
\(=\frac{30888-13608+8928}{89856}\)
\(=\frac{26208}{89856}=\frac{7}{24}\)
_Kik nha!! ^ ^
\(\frac{15.\left(\frac{1}{616}.\frac{1}{6.16}.\frac{1}{6.16}\right)}{33.\left(\frac{1}{6.16}.\frac{1}{6.16}.\frac{1}{6.16}\right)}=\frac{15}{35}\)
\(\dfrac{33}{6.16}\)-\(\dfrac{63}{16.26}\)+\(\dfrac{93}{26.36}\)
=\(\dfrac{3.11}{3.2.16}\)-\(\dfrac{3.21}{13.2.16}\)+\(\dfrac{93}{26.36}\)
=\(\dfrac{1}{2.16}\).11+\(\dfrac{1}{2.16}\).\(\dfrac{3.21}{13}\)+\(\dfrac{93}{26.36}\)
=\(\dfrac{1}{32}\).\(\dfrac{143-63}{13}\)+\(\dfrac{31.3}{26.36}\)
=\(\dfrac{1}{32}\).\(\dfrac{143-63}{13}\)+\(\dfrac{31.3}{26.3.12}\)
=\(\dfrac{1}{32}\).\(\dfrac{80}{13}\)+\(\dfrac{31}{36.12}\)
=\(\dfrac{5}{26}\)+\(\dfrac{31}{26.12}\)
=\(\dfrac{60+31}{26.12}\)
=\(\dfrac{91}{26.12}\)
=\(\dfrac{13.7}{13.2.12}\)
=\(\dfrac{7}{24}\)
Cảm ơn bạn nhiều nhé!