1234×38+64×1234-2468
=1234×38+64×1234-1234×2
=1234×(38+64-2)
=1234×100
=123400
1234 x 38 + 64 x 1234 - 2468 = 1234 x (38 + 64) -2468 = 1234 x 2 x (19 + 32) - 2468 = 2468 x 51 - 2468 = 2468 x (51 - 1) = 2468 x 50 =123400
ta thấy 2468=1234*2
vậy ta có : 1234 * 38 + 64 * 1234 -2 * 1234= 1234 * [38 + 64 -2]= 1234 * 100 = 123400
k mình nha
1234 x (38 +64 - 2) =
1234 x 100 = 123400
1234 x 38 + 64 x 1234 - 2468 = 123400
