化简求值:1/2x-2(x-1/3y²)+(-3/2x+1/3y²),其中x=-2,y=2/3
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化简求值:1/2x-2(x-1/3y²)+(-3/2x+1/3y²),其中x=-2,y=2/3
化简求值:1/2x-2(x-1/3y²)+(-3/2x+1/3y²),其中x=-2,y=2/3
化简求值:1/2x-2(x-1/3y²)+(-3/2x+1/3y²),其中x=-2,y=2/3
1/2x-2(x-1/3y2)+(-3/2x+1/3y2)
=1/2 x-2x+2/3y2 -3/2x+1/3y2
当 x=-2,y=2/3 =y2-3x
=4/9-3x(-2)
=6又4/9