已知|x+3|和(2x+y)²互为相反数,求3/4x²-(3y-1/4x²)+(y+1/2
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已知|x+3|和(2x+y)²互为相反数,求3/4x²-(3y-1/4x²)+(y+1/2x)的值
![已知|x+3|和(2x+y)²互为相反数,求3/4x²-(3y-1/4x²)+(y+1/2](/uploads/image/z/1747824-24-4.jpg?t=%E5%B7%B2%E7%9F%A5%7Cx%2B3%7C%E5%92%8C%282x%2By%29%26%23178%3B%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%823%2F4x%26%23178%3B-%283y-1%2F4x%26%23178%3B%29%2B%28y%2B1%2F2)
|x+3|和(2x+y)²互为相反数,
即|x+3|+(2x+y)²=0
x+3=0, 2x+y=0
x=-3, y=-2x=6
3/4x²-(3y-1/4x²)+(y+1/2x)
=x²-2y+1/2x
=9-12-3/2
=-9/2
即|x+3|+(2x+y)²=0
x+3=0, 2x+y=0
x=-3, y=-2x=6
3/4x²-(3y-1/4x²)+(y+1/2x)
=x²-2y+1/2x
=9-12-3/2
=-9/2
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