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√3-6x=0
6x=√3 //:6
x=√3/6
Df= x∈R /{√3/6, -√3/6}
B. f(x)=√4-2x
√4-2x=0
√4=2x
2=2x, -2=2x
x=1, x=-1
df= x∈R/{1,-1}
C. f(x)=√1-3x
√1=3x
1-=3x, 1=3x
x=-1/3, x=1/3
Df x∈R/{-1/3, 1/3}