Question

(78+78+78+78)x25的简便运算是什么？

Answer 1

原式=(78×4)×25
=78×4×25
=78×100
=7800

Answer 2

解:78(1十1十1十1)ⅹ25二7800

Answer 3

(78+78+78+78)×25
=78×4×25
=7800

Answer 4

（78+78+78+78）×25
＝78×4×25
＝78×100
＝7800

Answer 5

(78+78+78+78)×25
=(78×4)×25
=78×(4×25)
=78×100
=7800