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|x-2|+|y+3|+|z-5|=0 且因為|x-2|>=0 |y+3|>=0 |z-5|>=0 所以x-2=0 y+3=0 z-5=0 x=2 y=-3 z=5 |x|+|y|+|z|=2+3+5=10
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