2x^2-{-3x+[4x^2-(-x)^2-(2x^2-x)]},其中x=-2化简求值谢了!
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2x^2-{-3x+[4x^2-(-x)^2-(2x^2-x)]},其中x=-2化简求值谢了!
2x^2-{-3x+[4x^2-(-x)^2-(2x^2-x)]},其中x=-2化简求值
谢了!
2x^2-{-3x+[4x^2-(-x)^2-(2x^2-x)]},其中x=-2化简求值谢了!
2x^2-{-3x+[4x^2-(-x)^2-(2x^2-x)]}
=2x²-[-3x+(4x²-x²-2x²+x)]
=2x²-[-3x+(x²+x)]
=2x²-(-3x+x²+x)
=2x²-(-2x+x²)
=2x²+2x-x²
=x²+2x
=x(x+2)
=-2(-2+2)
=-2*0
=0
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