若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题
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若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题x
若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题
若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=
如题
若x-y+z=-4,x^2-(y+z)^2=8,则x+y+z=如题
x-(y+z)=-4
x²-(y+z)²=8
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(x+y+z)[x-(y+z)]=8
x+y+z=8/[x-(y+z)]=8/(-4)=-2
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