Comments by "Fhf Fhf" (@fhffhff) on "Алексей Навальный" channel.

  1. (3x+1)²y²+(-9x²-18x-5)y+2x²+7x+6=0 x=-1/3× y=(3x+5±(x+1))/2/(3x+1) (-18±12)/18=-1/3;-5/3 [y=(2x+3)/(3x+1),y =(x+2)/(3x+1); y=2/3+7/9/(x+1/3)\> (0;3)(2;1) y=1/3+5/9/(x+1/3)\>(0;2)(-2;0)
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  2. x²=-0,5-(7(z-3)²-31)/2/(1+y²)≥0 7(z-3)²+y²≤30 z[1;5] z=1,y[-1;1],z=2,y[-4;4] z=3,y[-5;5],z=4,y[-4;4],z=5,y[-1;1] x=±1/2;±1 (±1;0;1)(±1;0;5) x=±√11,5(y=±0)× x=±√(-0,5+31/2)×
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  3. 14x⁴+x²(-3y²-125)-5y⁴+82y²+51=0 x²=(3y²+125±17√((y²-6 137/289)²+2 (143 *289-137²)/289²))/28 (17n-289y²+1867)(17n+289y²-1867)=195380:4✓×
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  4. рх-0,5х²-2х-6=-0,5(х-р+2)²+0,5р²-2р-4≤0,5р²-2р-4 мин(n)=En=1;n(0,5n²+7n+18,5)= n(1/6n²+3,75n+22 1/12)=159 (n+7,5)³-36,25(n+7,5)-1647 3/4=0 n=-7,5+(822 7/8+√(59170²-26866)/72)¹/³+(822 7/8-√(59170²-26'866)/72)¹/³~1,75
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  5. ln(x+4)/ln(3-x)≥0°-4-*-3+°2-°3>x x[-3;2)
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  6. (5^x-125)/(5^x+31)/(5^x-0,2)≤0+°-1-*3+>x x(-1;3]
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  7. {x≥-2,(3^x-14-√193)(3^x-14+√193)≥0+*-*+ >x;{x≥-2,x(-∞;-log3((14+√193)/3)]U[log3 (13+√193);∞);x[log3(14+√193);∞)
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  8. log5(25-x²)(-∞;1]U[2;∞)[{x(-∞;-√20]U[√20; ∞),x(-5;5);x=0;x(-5;-√20]U{0}U[√20;5)
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