63×73−63×63简便方法？

Question

如题所述

Answer 1

63x73一63x63
=63×（73-63）
=63×10
=630

Answer 2

63×73-63×63=63×（73-63）=63×10=630

Answer 3

63x73一63x63
二63×（73一63）

二63x10
＝630

Answer 4

63×73-63×63
=63×(73-63)
=63×10
=630

Answer 5

等于6300