Question

78X4十78X3十78X3简便运算

Answer 1

 

Answer 2

78ⅹ4+78ⅹ3+78ⅹ3
=78ⅹ(4+3+3)
=78x10
=780

Answer 3

=78×（3+3+4）
=78×10
=780

Answer 4

=78x（4+3+3）
=78x10
=780

Answer 5

=（4+3+3）×78
=10×78
=780