25X7X12怎么简便计算？

Question

如题所述

Answer 1

简便计算
25X7X12
=25x7x4x3
=（25x4）x（7x3）
=100x21
=2100

Answer 2

25X7Ⅹ12
=25X7X4ⅹ3
=（25X4）x（7x3）
=100x21
=2100

Answer 3

25ⅹ7ⅹ12=2100

Answer 4

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
25×7×12
= 25×4×3×7。
= 100×21
=2100