若|x|+|y-3|=0,z的相反数是-6,则x+y+z=
2个回答
绝对值项恒非负,两非负项之和=0,两非负项分别=0
x=0 y-3=0
解得x=0 y=3
z的相反数是-6,z=-(-6)=6
x+y+z=0+3+6=9
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