Предмет: Алгебра, автор: albina0052001

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Любое из 3 задания пожалуйста
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Автор ответа: ЕкарныйБабай
0
(lgx)²-lgx=2
x>0
lgx=t
t²-t-2=0
D=1+8=9
t12=(1+-3)/2=-1 2 
lgx=-1
x=1/10
lgx=2
x=100
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