化简求值:2x²减y²+(2y²减x²)减(2x²+3y²),其中x=负2,y=3.
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化简求值:2x²减y²+(2y²减x²)减(2x²+3y²),其中x=负2,y=3.
化简求值:2x²减y²+(2y²减x²)减(2x²+3y²),其中x=负2,y=3.
化简求值:2x²减y²+(2y²减x²)减(2x²+3y²),其中x=负2,y=3.
2x²减y²+(2y²减x²)减(2x²+3y²),其中x=负2,y=3.
= 2x² - y² + 2y² -x² -2x² - 3y²
= -x² - 2y²
= - 4 - 2 x 9
= - 4 - 18
= - 22
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