2*(x+3/x^2)+2+2x^2+(2/x)+3=5
2x^2+5+(2/x)+(2(x+3)/x^2)=5
2x^2+5+(2/x)+(2x+6/x^2)=5
(2x^4+5x^2+2x+2x+6)/x^2=5
(2x^4+5x^2+4x+6)/x^2=5
2x^4+5x^2+4x+6=5x^2
2x^4+5x^2+4x=5x^2-6
2x^4+4x=-6
x^4+2x+3=0
x^4+2x=-3
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3х²-11х+8=0
3х²-3х-8х+8=0
3х(х-1)-8(х-1) = 0
(х-1)(3х-8) = 0
х-1=0 или 3х-8=0
х₁ = 1 3х=8
х=8/3
х₂ = 2 2/3
1) 7a
2)a√75
3)a√0,11
4)-2*0,12c+2|c|=-0,24c+2|c|