若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2=
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若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2=
若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2=
若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2=
x+y=3 x-y=5
x=4 y=-1
∴原式=15
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
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