若代数式2x²+3y+7的值为8,那么代数式-2x²-3y+8的值为( )
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![若代数式2x²+3y+7的值为8,那么代数式-2x²-3y+8的值为( )](/uploads/image/z/2569203-27-3.jpg?t=%E8%8B%A5%E4%BB%A3%E6%95%B0%E5%BC%8F2x%26%23178%3B%2B3y%2B7%E7%9A%84%E5%80%BC%E4%B8%BA8%2C%E9%82%A3%E4%B9%88%E4%BB%A3%E6%95%B0%E5%BC%8F-2x%26%23178%3B-3y%2B8%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89)
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若代数式2x²+3y+7的值为8,那么代数式-2x²-3y+8的值为( )
若代数式2x²+3y+7的值为8,那么代数式-2x²-3y+8的值为( )
若代数式2x²+3y+7的值为8,那么代数式-2x²-3y+8的值为( )
2X^2+3Y=1 -(2X^2+3Y)=-1 -2X^2-3Y+8=7
7
7
7