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Question

tính18/31x62/935/72x63/2034/65: 17/15111/64: 37/4012/19x41/52:82/19

HT.Phong (9A5) · Accepted Answer

$\dfrac{18}{31}\times\dfrac{62}{9}$$=\dfrac{18\times62}{31\times9}$$=\dfrac{2\times2}{1}$$=4$==============$\dfrac{35}{72}\times\dfrac{63}{20}$$=\dfrac{35\times63}{72\times20}$$=\dfrac{7\times7}{8\times4}$$=\dfrac{49}{32}$===============$\dfrac{34}{65}:\dfrac{17}{15}$$=\dfrac{34}{65}\times\dfrac{15}{17}$$=\dfrac{34\times15}{65\times17}$$=\dfrac{2\times3}{13\times1}$$=\dfrac{6}{13}$===========$\dfrac{111}{64}:\dfrac{37}{40}$$=\dfrac{111}{64}\times\dfrac{40}{37}$$=\dfrac{111\times40}{64\times37}$$=\dfrac{3\times5}{8\times1}$$=\dfrac{15}{8}$=============$\dfrac{12}{19}\times\dfrac{41}{52}:\dfrac{82}{19}$$=\dfrac{12}{19}\times\dfrac{41}{52}\times\dfrac{19}{82}$$=\dfrac{12\times41\times19}{19\times52\times82}$$=\dfrac{3\times1\times1}{1\times13\times2}$$=\dfrac{3}{26}$Câu trả lời: $\dfrac{18}{31}\times\dfrac{62}{9}$$=\dfrac{18\times62}{31\times9}$$=\dfrac{2\times2}{1}$$=4$==============$\dfrac{35}{72}\times\dfrac{63}{20}$$=\dfrac{35\times63}{72\times20}$$=\dfrac{7\times7}{8\times4}$$=\dfrac{49}{32}$===============$\dfrac{34}{65}:\dfrac{17}{15}$$=\dfrac{34}{65}\times\dfrac{15}{17}$$=\dfrac{34\times15}{65\times17}$$=\dfrac{2\times3}{13\times1}$$=\dfrac{6}{13}$===========$\dfrac{111}{64}:\dfrac{37}{40}$$=\dfrac{111}{64}\times\dfrac{40}{37}$$=\dfrac{111\times40}{64\times37}$$=\dfrac{3\times5}{8\times1}$$=\dfrac{15}{8}$=============$\dfrac{12}{19}\times\dfrac{41}{52}:\dfrac{82}{19}$$=\dfrac{12}{19}\times\dfrac{41}{52}\times\dfrac{19}{82}$$=\dfrac{12\times41\times19}{19\times52\times82}$$=\dfrac{3\times1\times1}{1\times13\times2}$$=\dfrac{3}{26}$

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