499 x 338 + 449 x 661 + 999 x 448
= 168662 + 329839 + 447552
= 498501 + 447552 = 946053
(728+277) x 2011 - (456+544) x 1010 - 389 -611
= 1005 x 2011 - 1000 x 1010 - 389 - 611
= 2021055 - 1010000 - 389 - 611
= 2021055 - ( 1010000 + 389 + 611 )
= 2021055 - 1011000
= 1010055
đúng thì like cho vs nha thanks nhìu