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
\(136\times52+864\times53\\ =136\times52+864\times\left(52+1\right)\\ \)
\(=136\times52+864\times52+864\\ 52\times\left(864+136\right)+864\\ 52\times1000+864\\ \)
\(=52000+864\\ =52864\)
Chúc bạn học tốt!!! ^_^
