(3:1)^3 27:9:9:3:3:3:1 怎么算的啊,
问题描述:
(3:1)^3 27:9:9:3:3:3:1 怎么算的啊,
答
(3:1)^3
=(3:1)×(3:1)×(3:1)
=(9:3:3:1)×(3:1) 破括号,逐项相乘
=27:9:9:9:3:3:3:1 你少写个9