Question

Tính nhanh : 27 x 49 + 49 x 12 + 10 x 51

Answer 1

27 . 49 + 49 . 12 + 10 . 51

= 49 . ( 27 + 12 ) + 10 .51

= 49 . 39 + 10 .51

= 1911 + 510

= 2421

Answer 2

27*49+49*12+10*51

=27*49+49*12+10*(49+2)

=27*49+49*12+10*49+10*2

=49*(27+12+10)+10*2

=49*49+20

=2401+20=2421

Answer 3

27 . 49 + 49 . 12 + 10 . 51

= 49 . ( 27 + 12 ) + 10 .51

= 49 . 39 + 10 .51

= 1911 + 510

= 2421