<span>lg²x+lgx²=3
</span><span>lg²x + 2lgx - 3 = 0
lgx = z
z</span>² + 2z - 3 = 0
z₁ = - 3
z₂ = 1
<span>1) lgx = - 3
x = 10^(-3)
x</span>₁ = 0,001
2) lgx = 1
x₂ = 10
Ответ: b) <span>0,001;10</span>
<span>1/4(2y+1)=8
</span><span>2y+1=8:1/4
</span><span>2y+1=32
2y=32-1
2y=31
y=31/2
y= 15,5
</span>
У=2 х=5 делить на 3 равно 1 целая 2 третьих