1/4(-4x∧2+2x-8y)-(1/2x-2y),其中x=1/2,y=2010 化简后求值
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1/4(-4x∧2+2x-8y)-(1/2x-2y),其中x=1/2,y=2010 化简后求值
1/4(-4x∧2+2x-8y)-(1/2x-2y),其中x=1/2,y=2010 化简后求值
1/4(-4x∧2+2x-8y)-(1/2x-2y),其中x=1/2,y=2010 化简后求值
1/4(-4x²+2x-8y)-(1/2x-2y)
=-x²+1/2x-2y-1/2x+2y
=-x²
=-(1/2)²
=-1/4
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