(X-3)(X+3)-2 3-2x/2-3X〈等于1 根号8-X -根号2X-3>0 (X-3)(X+3)-2 3-2x/2-3X〈等于1 根号8-X -根号2X-3>0
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(X-3)(X+3)-2 3-2x/2-3X〈等于1 根号8-X -根号2X-3>0
(X-3)(X+3)-2
3-2x/2-3X〈等于1
根号8-X -根号2X-3>0
(x-3)(x+3)
1)X^2-9<1 x^2<10 所以X属于(-根号10,根号10)
2)2x^2-6x-x+3>-2 2x^2-7x+5>0 (2x-5)(x-1)>0 所以x属于(-无穷,1)U(5/2,正无穷)
3)(3-2x-2+3x)/(2-3x)<=0 (x+1)/(3x-2)>=0 (x+1)(3x-2)>=0 所以x属于(...
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1)X^2-9<1 x^2<10 所以X属于(-根号10,根号10)
2)2x^2-6x-x+3>-2 2x^2-7x+5>0 (2x-5)(x-1)>0 所以x属于(-无穷,1)U(5/2,正无穷)
3)(3-2x-2+3x)/(2-3x)<=0 (x+1)/(3x-2)>=0 (x+1)(3x-2)>=0 所以x属于(-无穷,-1]U(2/3,正无穷)
4)8-x>2x-3 3x<11 x<11/3 8-x>0 x<8 2x-3>0 x>3/2 所以x属于(3/2,11/3)
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