Question

GENTE ME AJUDEM PVF ME DE A RESPOSTA PELOMENOS DE UMA E SEM COPIA QUALQUER COISA SE N DENUNCIO TA VELENDO 25 PONTOS MELHOR RESPOSTA E AINDA EU VOU SEGUIR O SEU PERFIL Efetue as multiplicações a seguir e simplifique os resultados quando possível
c)1/8×4/9
d)9/5×6/18
e)4/6×3/21
f)12/5×10/24
g)15/20×7/21
h)16/51×18/48
i)70/24×55/100
j)144/27×30/72​​

Answer 1

$\Large\boxed{\begin{array}{l}\tt c)~\sf\dfrac{1}{\backslash\!\!\!8}_2\times\dfrac{\backslash\!\!\!4}{9}=\dfrac{1}{18}\\\\\tt d )~\sf\dfrac{\diagdown\!\!\!\!9}{5}\times\dfrac{6}{\diagdown\!\!\!\!\!\!18}_2=\dfrac{\backslash\!\!\!6^3}{5\cdot\backslash\!\!\!2}=\dfrac{3}{5}\\\\\tt e)~\sf\dfrac{4}{6}\times\dfrac{3}{21}=\dfrac{2\times\diagup\!\!\!2}{\backslash\!\!\!3\times\diagup\!\!\!2}\times\dfrac{\backslash\!\!\!3}{21}=\dfrac{2}{21}\end{array}}$

$\Large\boxed{\begin{array}{l}\tt f)~\sf\dfrac{12}{5}\times\dfrac{10}{24}=\dfrac{\diagdown\!\!\!\!\!\!12}{\backslash\!\!\!5}\times\dfrac{\backslash\!\!\!5\times2}{2\times\diagdown\!\!\!\!\!\!12}=\dfrac{2}{2}=1\\\\\tt g)~\sf\dfrac{15}{20}\times\dfrac{7}{21}=\dfrac{\backslash\!\!\!3\times\backslash\!\!\!5}{4\times\backslash\!\!\!5}\times\dfrac{\backslash\!\!\!7}{\backslash\!\!\!7\times\backslash\!\!\!3}=\dfrac{1}{4}\end{array}}$

$\Large\boxed{\begin{array}{l}\tt h)~\sf\dfrac{16}{51}\times\dfrac{18}{48}=\dfrac{\diagdown\!\!\!\!\!\!16}{\backslash\!\!\!3\times17}\times\dfrac{\backslash\!\!\!3\times\backslash\!\!\!3\times2}{\backslash\!\!\!3\times\diagdown\!\!\!\!\!\!16}=\dfrac{2}{17}\\\\\tt i)~\sf\dfrac{70}{24}\times\dfrac{55}{100}=\dfrac{7\backslash\!\!\!0}{24}\times\dfrac{\backslash\!\!\!5\cdot11}{\backslash\!\!\!5\cdot2\backslash\!\!\!0}=\dfrac{77}{48}\end{array}}$

$\Large\boxed{\begin{array}{l}\tt j)~\sf\dfrac{144}{27}\times\dfrac{30}{72}=\dfrac{2\times\diagdown\!\!\!\!\!\!72}{\backslash\!\!\!3\times9}\times\dfrac{\backslash\!\!\!3\times10}{\diagdown\!\!\!\!\!\!72}=\dfrac{20}{9}\end{array}}$