已知|x+2|+(y-1/2)²=0,求代数式1/3x³-2x²y+3x²y+5
2个回答
由|x+2|+(y-1/2)²=0得x=-2,y=1/2
所以1/3x³-2x²y+3x²y+5xy²+7-5xy²
=-1/24+2*2*1/2+7
=9-1/24
=215/24
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