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lx+4l+lx-y+6l=0兩項均是非負值,和為0,則它們都是0∴x+4=0,x-y+6=0∴x=-4,y=2∴x平方y-【2x平方y-(3xy-xy平方)-3x平方】=x²;y-2x²;y+(3xy-xy²;)+3x²;=-x²;y+3xy-xy²;+3x²;=-xy(x+y)+3x(…
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