7х=4*2,8 х=11,2/7=1,6 х=1,6
1) x + 7 ≥ 0 ⇒ x ≥ - 7
2) 5 - x > 0 ⇒ - x > - 5 ⇒ x < 5
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- 7 5
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Область определения - все значения x ∈ [- 7 ; 5)
605*30:100=181,5-----------------------------------------
Log0,5(3x^2-2x)=0
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ОДЗ:
3x^2-2x>0; x(3x-2)>0; x <0; x>2/3
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log0,5(3x^2-2x)= log0,5(1)
3x^2-2x=1
3x^2-2x-1=0
D=(-2)^2-4*3*(-1)=16
x1=(2-4)/6=-2/6=-1/3
x2=(2+4)/6=1
Ответ: {-1/3; 1}