[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:2024/06/22 02:55:22
![[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