Question

3/5×2/9×5/14等于多少简便运算脱式计算？

Answer 1

3/5x2/9x5/14
3/5x5/14x2/9
3/14x2/9
1/21

Answer 2

3/5×2/9×5/14
=1/5×2/3×5/14
=2/3×1/14
=1/21

Answer 3

用乘法交换律计算
解:
3/5x2/9x5/14
=(3/5)x(5/14)x(2/9)
=(3x5x2)/(5x14x9)
=1/21