-（-0.5x³-2x²y+1/2xy²）去括号

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-（-0.5x³-2x²y+1/2xy²）去括号-（-0.5x³-2x²y+1/2xy²）去括号-（-0.5x³-2x²

-（-0.5x³-2x²y+1/2xy²）去括号
-（-0.5x³-2x²y+1/2xy²）去括号

-（-0.5x³-2x²y+1/2xy²）去括号
-（-0.5x³-2x²y+1/2xy²）
=0.5x³+2x²y-1/2xy²