28 x 18 + 9 x 44
= 504 + 9 x 44
= 504 + 396
= 900
\(28\times18+9\times44\)
\(=36\times14+36\times11\)
\(=36\times\left(14+11\right)\)
\(=36\times25\)
=900
=28x18+9x44
=504+9x44
=504+306
=900
Sai môn hok bn ơi
28 x 18 + 9 x 44
= 504 + 396
= 900
Hok tốt nha bn 
28x18=504
9x44=396
504+396=900
ĐS:900
28 x 18 + 9 x 44
= 36 x 14 + 36 x 11
= 36 x (14 + 11)
= 36 x 25
= 900
