当X=-2,Y=2/3,1/2X-(-2/3X+1/3Y平方)-(2X-2/3Y平方)等于?
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当X=-2,Y=2/3,1/2X-(-2/3X+1/3Y平方)-(2X-2/3Y平方)等于?
当X=-2,Y=2/3,1/2X-(-2/3X+1/3Y平方)-(2X-2/3Y平方)等于?
当X=-2,Y=2/3,1/2X-(-2/3X+1/3Y平方)-(2X-2/3Y平方)等于?
1/2X-(-2/3X+1/3Y平方)-(2X-2/3Y平方)
=1/2X+2/3X-1/3Y平方-2X+2/3Y平方
=-5/6X+1/3Y平方
=5/3+4/27
=49/27
1/2X-(-2/3X+1/3Y平方)-(2X-2/3Y平方)
=1/2x+2/3x-1/3Y²-2x+2/3Y²
=-5/6x+1/3Y²
=-5/6*(-2)+1/3*(2/3)²
=5/3+4/27
=49/27
67/27