1-1/2×[3×(-2/3)²-(-1)×-1×-1×-1]+1/4÷(-1/2²)
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1-1/2×[3×(-2/3)²-(-1)×-1×-1×-1]+1/4÷(-1/2²)1-1/2×[3×(-2/3)²-(-1)×-1×-1×-1]+1/4÷(-1/2&
1-1/2×[3×(-2/3)²-(-1)×-1×-1×-1]+1/4÷(-1/2²)
1-1/2×[3×(-2/3)²-(-1)×-1×-1×-1]+1/4÷(-1/2²)
1-1/2×[3×(-2/3)²-(-1)×-1×-1×-1]+1/4÷(-1/2²)
-1/6
=1-1/2[3*4/9-1]-1=-1/6
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