решите уравнения
1. (x-1)(x+1)-x(x-2)=0
2. x^2-4=0
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х^2+х-х-1-х^2+2х=0
2х-1=0
2х=1
х=1/2
2. х^-4=0
х^2=4
х1=2 х2= -2