Question

125×23×40并用乘法交换律和结合律进行简便计算？

Answer 1

125x23x40
=125x8x23x5
=1000x115
=115000

Answer 2

乘法分配律为：两个数的和与一个数相乘，先将它们与这个数分别相乘，再相加，积不变．即：（a+b）×c=a×c+b×c．反过来则：a×c+b×c=（a+b）×c
125×23×40
= 125×40×23
= 5000×23
= 115000