化简再求值;-8x²-【5y-3(2x²-3y)+15】,其中x=-1,y=2
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化简再求值;-8x²-【5y-3(2x²-3y)+15】,其中x=-1,y=2
化简再求值;-8x²-【5y-3(2x²-3y)+15】,其中x=-1,y=2
化简再求值;-8x²-【5y-3(2x²-3y)+15】,其中x=-1,y=2
-8x²-【5y-3(2x²-3y)+15】
=-8x²-5y+3(2x²-3y)-15
=-8x²-5y+6x²-9y-15
=-8x²+6x²-9y-5y-15
=-2x²-14y-15
=-2*1-14*2-15
=-2-28-15
=-45
=-8x²-(5y-6x²+9y+15)
=-2x²-14y-15
=-45