-1/2+1/2÷【（-1又1/2）³+（-1/2）²】×（-2.5）²
=-1/2+1/2÷（-27/8+1/4)×25/4
=-1/2+1/2÷(-25/8)×25/4
=-1/2+1/2×(-8/25)×25/4
=-1/2-1
=-3/2
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