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Cabadath
@Cabadath
August 2022
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m11m
Verified answer
5. 3x² +2x-5=0
D=2² -4*3*(-5)=4+60=64
x₁=(-2-8)/6= -10/6 = -5/3 = -1 ²/₃
x₂=(-2+8)/6=6/6=1
Ответ: -1 ²/₃; 1.
6. 3x<4 -2x>1.8
x<4/3 x< -0.9
x< -0.9 - решение системы
x∈(-∞; -0.9)
7. 3x-4 < 2(x+1)
3x-4 < 2x+2
3x-2x < 2+4
x<6
x∈(-∞; 6)
8.
x² -5x-6≥0
x² -5x-6=0
D=25+24=49
x₁=(5-7)/2= -1
x₂=(5+7)/2=6
+ - +
-------- -1
---------
6 -----------
\\\\\\\\\ \\\\\\\\\\\\
x∈(-∞; -1]U[6; +∞)
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Answers & Comments
Verified answer
5. 3x² +2x-5=0D=2² -4*3*(-5)=4+60=64
x₁=(-2-8)/6= -10/6 = -5/3 = -1 ²/₃
x₂=(-2+8)/6=6/6=1
Ответ: -1 ²/₃; 1.
6. 3x<4 -2x>1.8
x<4/3 x< -0.9
x< -0.9 - решение системы
x∈(-∞; -0.9)
7. 3x-4 < 2(x+1)
3x-4 < 2x+2
3x-2x < 2+4
x<6
x∈(-∞; 6)
8.
x² -5x-6≥0
x² -5x-6=0
D=25+24=49
x₁=(5-7)/2= -1
x₂=(5+7)/2=6
+ - +
-------- -1 --------- 6 -----------
\\\\\\\\\ \\\\\\\\\\\\
x∈(-∞; -1]U[6; +∞)