Ответ:
Объяснение:
1) ОДЗ:x>0
log₂²x-log₂(x/2)-7=0
log₂²x-log₂x+log₂2-7=0
log₂²x-log₂x+1-7=0
log₂²x-log₂x-6=0
log₂x₁=3⇒x₁=2³=8
log₂x₂=-2⇒x₂=2⁻²=1/4=0.25
2) ОДЗ: x>0
x*lgx-lgx+2x-2=0⇒lgx(x-1)+2(x-1)=0⇒(x-1)(lgx+2)=0
1) x-1=0⇒x=1
2) lgx+2=0⇒lgx=-2⇒x=0.01
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Ответ:
Объяснение:
1) ОДЗ:x>0
log₂²x-log₂(x/2)-7=0
log₂²x-log₂x+log₂2-7=0
log₂²x-log₂x+1-7=0
log₂²x-log₂x-6=0
log₂x₁=3⇒x₁=2³=8
log₂x₂=-2⇒x₂=2⁻²=1/4=0.25
2) ОДЗ: x>0
x*lgx-lgx+2x-2=0⇒lgx(x-1)+2(x-1)=0⇒(x-1)(lgx+2)=0
1) x-1=0⇒x=1
2) lgx+2=0⇒lgx=-2⇒x=0.01