-3(2x^2-xy)-4(-6+xy+x^2)其中x,y满足(x+2)^2+丨y-3丨=0
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-3(2x^2-xy)-4(-6+xy+x^2)其中x,y满足(x+2)^2+丨y-3丨=0-3(2x^2-xy)-4(-6+xy+x^2)其中x,y满足(x+2)^2+丨y-3丨=0-3(2x^2-
-3(2x^2-xy)-4(-6+xy+x^2)其中x,y满足(x+2)^2+丨y-3丨=0
-3(2x^2-xy)-4(-6+xy+x^2)其中x,y满足(x+2)^2+丨y-3丨=0
-3(2x^2-xy)-4(-6+xy+x^2)其中x,y满足(x+2)^2+丨y-3丨=0
(x+2)^2+丨y-3丨=0
而(x+2)^2>=0,丨y-3丨>=0
∴丨y-3丨=0,(x+2)^2=0
y=3,x=-2
-3(2x^2-xy)-4(-6+xy+x^2)
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=-10x^2-xy+24
=-10*(-2)^2-3*(-2)+24
=-10
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