Question

    

 

Answer 1

2/5 x 4/7 + 3/5 x 4/7

= ( 2/5 + 3/5 ) x 4/7

=  1 x 4/7

= 4/7

Answer 2

2/5 x 4/7 + 3/5 x 4/7 
= (2/5 + 3/5) x 4/7
= 1 x 4/7
= 4/7

2022 x 468 - 2022 x 357 - 2022 x 11
= 2022 x (468 - 357 - 11)
= 2022 x 100
= 202200

Answer 3

a)\(=\dfrac{4}{7}\times\left(\dfrac{2}{5}+\dfrac{3}{5}\right)=\dfrac{4}{7}\times1=\dfrac{4}{7}\)

b)\(=2022\times\left(468-357-11\right)=2022\times100=202200\)

Answer 4

a, \(\dfrac{2}{5}\times\dfrac{4}{7}+\dfrac{3}{5}\times\dfrac{4}{7}=\) 

\(=\left(\dfrac{2}{5}+\dfrac{3}{5}\right)\times\dfrac{4}{7}\) 

\(=\dfrac{5}{5}\times\dfrac{4}{7}\) 

\(=1\times\dfrac{4}{7}=\dfrac{4}{7}\)

\(b,2022\times468-2022\times357-2022\times11=\)

\(=2022\times\left(468-357-11\right)\) 

\(=2022\times100\) 

\(=202200\)