52 x 44 + 84 x 52 + 52 - 52 x 29

= 52 x ( 44 + 84 + 1 - 29 )

= 52 x        100

= 5200

nkớ k nhoa =33

    52x44+84x52+52-52x29

=52x(44+84+1+29)

=52x100

=52 000

                                                                                      HT

a) \(19\times\left(52+38\right)-9\times\left(52+38\right)=\)

\(=\)     \(19\times90-9\times90\) 

\(=90\times\left(19-9\right)\) 

\(=90\times10\) 

\(=900\) 

b) \(\dfrac{2}{5}\div\dfrac{3}{7}\times\dfrac{3}{7}\div\dfrac{2}{5}+2019=\)

\(=\left(\dfrac{2}{5}\div\dfrac{2}{5}\right)\times\left(\dfrac{3}{7}\div\dfrac{3}{7}\right)+2019\) 

\(=1\times1+2019\) 

\(=2019\)

52 x 100 x 4 

= 5200 x 4 

= 20800

52 x 100 x 4

= 5200 x 4

= 20800

\(65,39\times54-52\times65,39-65,39\)

\(=65,39\times\left(54-52-1\right)\)

\(=65,39\times1\)

\(=65,39\)

  65,39 x 54 - 52 x 65,39 -65,39 

= 65,39 x 54 - 52 x 65,39 - 65,39 x1 

=65,39 x ( 54 - 52 - 1 )

=65,39 x 1 

=   65,39 

   136 x 52 + 864 x 53

= 136 x 52 + 864 x  ( 52 + 1 )

= 136 x 52 + 864 x 52 + 864 x 1

= ( 136 + 864 ) x 52 + 864

= .........................

136 x 52 + 864 x 53

= 136 x 52 + 864 x ( 52 + 1)

= 136 x 52 + 864 x 52 +864

= 52 x ( 864 + 136 ) + 864

= 52 x 1000 + 864

= 52000 + 864 

= 52864

             136 x 52 + 864 x 53

= 136 x 52 + 864 x (52 + 1)

= 136 x 52 + 864 x 52 + 864 x 1 

= 52 x (136 + 864) + 864

= 52 x 1000 + 864

= 52 000 + 864 

= 52 864

=47 x (52+49-1)=47x 100= 4700

47 x 52 + 47 x 49 - 47

= 47 x 52 + 47 x 49 - 47 x 1

= 47 x (52+49-1)

= 47 x 100

= 4700

4700 kết quả học t

\(19\) x \(\left(52+38\right)-9\) x \(\left(52+38\right)\)

\(=19\) x \(90-9\) x \(90\)

\(=\left(19-9\right)\) x \(90\)

\(=10\) x \(90\)

\(=900\)

1701