1) D(y)=(-∞;0)∪(0;+∞);
2) D(y)=(-∞;-1/10)∪(-1/10;+∞).
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1) D(y)=(-∞;0)∪(0;+∞);
2) D(y)=(-∞;-1/10)∪(-1/10;+∞).