Question

A=19991999*200020002000

B=20002000*199919991999

A-B=?

Answer 1

A-B = 1999 x 10001 x 2000 x 100010001 - 2000 x10001 x 1999 x 100010001

A-B = 1999 x 100010001 x 2000 x 10001 - 1999 x 100010001 x 2000 x 10001

A-B =0

Vậy A-B = 0

Answer 2

A-B = 1999 x 10001 x 2000 x 100010001 - 2000 x10001 x 1999 x 100010001

A-B = 1999 x 100010001 x 2000 x 10001 - 1999 x 100010001 x 2000 x 10001

A-B =0

Vậy A-B = 0