[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³]
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[2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2）³][2×（-1/2）²-3²×（-1/3）³]÷[1-（-1/2
[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