y=lgx+1/2x-1
D(y): x>0, 2x-1#0
x#1/2
D(y)=(0;1/2)U(1/2;+ бесконечность)
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y=lgx+1/2x-1
D(y): x>0, 2x-1#0
x#1/2
D(y)=(0;1/2)U(1/2;+ бесконечность)