A^2-b^2=(a-b)(a+b)
(x^2+1-x√5)(x^2+1+x√5) = (x^2+1)^2 - (x√5)^2 = x^4+2x^2+1-5x^2=x^4-3x^2+1
(6,6^3-64):(2*6,6<span>^2 +8*</span>6,6 +32)=(287.496-64):(2*43.56+52.8+32)=223.496:171.92=1.3
(-5х+3)(-х+6)=0
-5х₁+3=0
х₁=3/5=0,6 меньший
-х₂+6=0
х₂=6
<span>(√7-√3)²= </span>√7√7-2√7√3-√3(-√3) = 7-2√21+3=10-2√21