20 x 45 + 27 x 25 + 27 + 15 x 27
= 20 x 45 + 27 x 25 + 27 x 1 + 15 x 27
= 27 x ( 25 + 1 + 27 ) + 20 x 45
= 27 x 53 + 20 x 45
= 1431 + 900
= 2331
\(20\times45+27\times25+27+15\times27\)
\(=27\times\left(25+1+15\right)+20\times45\)
\(=27\times41+2045\)
\(=1107+2045\)
\(=3152\)
20x45+27x25+27+15x27
=27x(25+1+15)+20x45
=27x41+900
=1107+900
=2007
bằng 2331 nha bạn
hahs
ủng hộ nha
bạn