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lvovl
@lvovl
August 2021
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Помогите срочно
A(a-2)-a^2>5-3a
3x(3x-1)-9x^2<3x+6
5y^2-y(y+4)≧100
7c(c-2)-c(7c+1)<3
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Verified answer
A(a-2)-a²>5-3a
a²-2a-a²>5-3a
-2a+3a>5
a>5
a∈(5; +∞)
3x(3x-1)-9x²<3x+6
9x²-3x-9x²<3x+6
-3x-3x<6
-6x<6
x>-1
x∈(-1; +∞)
5y²-5y(y+4)≥100
5y²-5y²-20y≥100
20y≤-100
y≤-5
y∈(-∞; -5]
7c(c-2)-c(7c+1)<3
7c²-14c-7c²-c<3
-15c<3
c>-3/15
c>-1/5
c>-0,2
c∈(-0,2; +∞)
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Answers & Comments
Verified answer
A(a-2)-a²>5-3aa²-2a-a²>5-3a
-2a+3a>5
a>5
a∈(5; +∞)
3x(3x-1)-9x²<3x+6
9x²-3x-9x²<3x+6
-3x-3x<6
-6x<6
x>-1
x∈(-1; +∞)
5y²-5y(y+4)≥100
5y²-5y²-20y≥100
20y≤-100
y≤-5
y∈(-∞; -5]
7c(c-2)-c(7c+1)<3
7c²-14c-7c²-c<3
-15c<3
c>-3/15
c>-1/5
c>-0,2
c∈(-0,2; +∞)