Question

369✖️78➖123✖️24的简便方法？

Answer 1

原式=369×78-123×3×8
=369×(78-8)
=369×70
=25830

Answer 2

=123【（3*78）-24】
=123（234-24）
=123*210
=123（200+10）
=24600+1230
=25830

Answer 3

=123×3×78－123×24
=123×（3×78－24）
=123×210
25830