Question

78x34+65x78+78简便运算

Answer 1

78x34+65x78+78
=78*（34+65+1）
=78*100
=7800
望采纳

Answer 2

78*34+64*78+78
=（34+1+65）*78
=100*78
=7800

Answer 3

=78(34+65+1)
=78×100
=7800