1)(х^2+4)^2+(х^2+4)-30=0
2)(х^2-8)^2+3,5(х^2-8)-2=0
3)(1-х^2)^2+3,7(1-х^2)+2,1=0
4)(1+х^2)^2+0,5(1+х^2)-5=0
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