作业帮[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³]
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/17 01:09:04
![[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³]](/uploads/image/z/1267414-70-4.jpg?t=%5B2%C3%97%EF%BC%88-1%2F2%EF%BC%89%26sup2%3B-3%26sup2%3B%C3%97%EF%BC%88-1%2F3%EF%BC%89%26sup3%3B%5D%C3%B7%5B1-%EF%BC%88-1%2F2%EF%BC%89%26sup3%3B%5D)
[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³]
[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³]
[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³]
[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³]
=[2×(1/4)-9×(-1/27)]÷[1-(-1/8)]
=(1/2+1/3)÷(1+1/8)
=(5/6)÷(9/8)
=20/27