\(136.\left(143+157\right)+157.64+143.64\)
\(=136.300+157.64+143.64\)
\(=136.300+64.\left(157+143\right)\)
\(=136.300+64.300\)
\(=300.\left(136+64\right)\)
\(=300.200\)
\(=60000\)
Thế này mới đúng :
136 . ( 143 + 157 ) + 157 . 64 + 143 . 64
= 136 . 300 + ( 157 + 143 ) . 64
= 40800 + 300 . 64
= 40800 + 19200
= 60000