(x+3)(x-4)=-12
(3x-1)^2=1
(2x+3)(3x+1)=11x+30
18-(x-5)(x-4)=-2
5x+(2x+1)(x-3)=0
x^2-5=(x-5)(2x-1)
через дискриминант
ОТВЕТЫ: 1) 0,1
2)0, 2/3
4)0,9
5)+- 1,5
6)1,10
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