Question

tíh bằng 2 cách 

a. ( 5/7 + 2/3 ) x 7/11                     b. (1/5 + 3/9 ) X 2/3 

Answer 1

\(a.\left(\dfrac{5}{7}+\dfrac{2}{3}\right)\times\dfrac{7}{11}=\dfrac{29}{21}\times\dfrac{7}{11}=\dfrac{29}{33}\)

\(C2:\dfrac{5}{7}\times\dfrac{7}{11}+\dfrac{2}{3}\times\dfrac{7}{11}=\dfrac{5}{11}+\dfrac{14}{33}=\dfrac{29}{33}\)

\(b.\left(\dfrac{1}{5}+\dfrac{3}{9}\right)\times\dfrac{2}{3}=\dfrac{8}{15}\times\dfrac{2}{3}=\dfrac{16}{45}\)

\(C2:\dfrac{1}{5}\times\dfrac{2}{3}+\dfrac{3}{9}\times\dfrac{2}{3}=\dfrac{2}{15}+\dfrac{2}{9}=\dfrac{16}{45}\)

Answer 2

a.(75​+32​)×117​=2129​×117​=3329​

�2:57×711+23×711=511+1433=2933C2:75​×117​+32​×117​=115​+3314​=3329​

�.(15+39)×23=815×23=1645b.(51​+93​)×32​=158​×32​=4516​

�2:15×23+39×23=215+29=1645C2:51​×32​+93​×32​=152​+92​=4516​
 

 

Answer 3

a.(75​+32​)×117​=2129​×117​=3329​

�2:57×711+23×711=511+1433=2933C2:75​×117​+32​×117​=115​+3314​=3329​

 

�.(15+39)×23=815×23=1645b.(51​+93​)×32​=158​×32​=4516​

�2:15×23+39×23=215+29=1645C2:51​×32​+93​×32​=152​+92​=4516​