Comments by "Fhf Fhf" (@fhffhff) on "Свободная Пресса" channel.

  1. 9/4а-а=5/4а 5/4а=3 а=12/5 S=0,5*12/5*24/5+0,5*4,4*4,8+4,8*2,4=27,84
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  2. |(0;1)En=0;∞(-1)^n/(2n)!(ln^(2n-1)x (x-x²/2)-(2n-1)ln^(2n-2)x(x-x²/4)+.. -(2n-1)!(X-x²/2^(2n)))=0,5ln0,4
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  3. Y'y''/(y'²-1)=x/(1+x²) 0,5ln|y'²-1|=0,5 ln(x²+1)+c y'=±√(1+(x²+1)c)[{c=0,y=±x+c1;{c>0,y=±√c(0,5x√(x² +1+1/c)+0,5(1+1/c)ln|x+√(x²+1+1/c)|)+c1;{c<0,y=±√-c(0,5x√(-x²-1-1/c)+0,5(-1-1/c)arcsin(x/√(-1-1/c)))+c1.
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  4. -ce^(-(p-a)b)/(p-a)=e^(-2s)/(p+2) a=-2,c=-e⁴,b=2 b=4,c=3e⁸ y={(-e⁴+3e⁸)e^(-2t),t≥4, -e⁴e^(-2t),t[2;4), 0,t[0;2).
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  5. (1,5cos2t-3sin2t)e^t✓
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  6. {b=a&1/a,c=b-1/b,a≠±1,a≠(±1±√5)/2 0=(a²-1)³-(a²-1)-1/3;a²-1=(1/6+√(1/4-1/3)/3)¹/³+(..-..)..=2/√3cos(10°+2/3 πn) a=±√(1+2/√3cos(10°+120°n)) -3✓
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  7. 3/(r-1)=3/(r-1),b=2r-1,a=r+3 r²=9+(r-1)² r=5,S=9*8=72
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  8. 7l/(ab)=7 l=ab a²b²+8abcos/_a=20 arcsin(b/√(1+b²+2bcos/_a)sin/_a) (a-1)/2/cos/_a=b cos/_a=±a(a-1)/√(6-a)/4. arcsin(8(6-a)/√(-3a²-a+33) *√(96-16a-a²(a-1)²)) угол ∆ справа.arcsin(√(96-16a-a²(a-1)²)/12) √(-3a²-a+33)*8(6-a)*√(96-16a -a²(a-1)²)√(48+16a+a²(a-1)²)+√(-3a ²-a+33-64(6-a)²*(96-16a-a²(a-1)²)) •√(96-16a-a²(a-1)²))=112(6-a)√(96-16a-a²(a-1)²) a=-23/9/(197/27+4√3 54/9)¹/³+5/3+(197/27+4√354/9)¹/³ l=2√(13/3+23/9/(197/27+4√354/9) ¹/³-(197/27+4√354/9)¹/³)(cm) ?=7/3-(197/27+4√354/9)¹/³+23/9/(197/27+4√354/9)¹/³(cm)
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  9. Arctg((√r2-√r1)/(√r1+√r2)), arctg(√(r1/r2)) (√r2+r1/√r2)/(√ r2+r1/√r2)=1,135°
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  10. (x+2√3/3)³-(x+2√3/3)+7√3/9-1=0 x=-2√3/3+2√3/3cos(1/3arccos(-7/2+3√3/2)+2/3πn) 5-3√3<0
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  11. √((m-1)/m)(√(m+1)+1)=m,m[1;=) 0=(m²-m-1)m m=0;(1±√5)/2{(1+√5(/2}
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  12. [x²-x-2=0,x²+x-1=0;[x=2,x=-1,x=(-1±√5)/2.
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  13. I(1-i)=1+i z=3(ln²√2+π²(1/4+2/3n)(1/4+2m)+i*πln2(1/3n-m))/(ln²√2+(π/4+2πm)²)
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  14. z=-i
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  15. (a-R)²+(b-R)²=R² a=R+√(2bR-b²) cos(45°-arctg(√(2bR-b²)/b))=5/√ (2bR) b[0;5√2],R=(25-5√2b+b²)/b ab=(25/b)b=25
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  16. o=arctg(12/x)-arctg(3/x) o'(x)=-12/(x²+144)+3/(x²+9)=0 x=±6-+->x E)
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  17. 1/sinx=1/sinxsin(20°+x)/sin(60°-x) x=20°✓
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  18. {x=a±√(-(y+2a)²+(1+a)²),x²+y²+4(x-y)a=4+4a-7a²;-0,24/a-0,16±√(-0,81-1,08a+22,14a²+ 27a³+99/4a⁴)/5/a=y;a>0,x=+,y>1,125a-1/4- 3/8/a x=a±√(-(2a-0,24/a-0,16±√(-0,81-1,0 8a+22,14a²+27a³+99/4a⁴)/5/a)²+(1+a)²) 9*123876/121²/25²-12288/1331/25a+(a²+6/11a+903/121/25)²≥0 +*-0,18*0,19 +>а ає(-∞;-0,18]U[0,19!∞){-0,18;0,19}
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  19. 1/4(-e^(-3t)+5e^t)✓
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  20. $(a;∞)(bcost+csint)e^(-2t)e^-ptdt= e^(-(p+2)a)((bp+2b+c)cosa+sina(cp +2c-b))/((p+2)²+1) {c=-e^6(2cos3-sin3),b=e⁶(cos3+2sin3),a=3. Y=e⁶(cos3+2sin3)cost-e⁶(2cos3-sin3)sint
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  21. {b=2a/(3a-2),[a=0,a=1;c=3a/(4a-3);{(0;0;0)(1;2;3)}
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  22. {x≥3,[x=(7+√13)/2,x=1;{(7+√13)/2}
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  23. {z=6-x-y,x=3-y/2±√(-3/4y²+3y), x[0;6],y[0;6],[y=4,y=1;{(1;4;1)(4;1;1)(1;1;4)}
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  24. [{a=0,x=1,y=-14;{[a(-=;0)U[1,75;4], a(0;4];x=(8±4√(4-a))/a,y=±4√(4-a)-6;{x=-2/(a-2),y=-2a/(a-2)-14. A=2,x=4±2√2,y=±4√2-6 a=4,(2;-6),(-1;-18) a=1,75,(8/7;-12)(8;0) a(-∞;0)U(0;1,75) a(-∞;0)U(0;1,75]U{2}U{4}
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  25. 2x/(x-2),x f(2x/(x-2))-xf(x)=x², f(x)=-x²(x³-4x²+4x+4)/(x-2)²/(x²-1)
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  26. ln(1+7t)e^(5t)/t
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  27. y²-yx-x²=0 y=(1±√5)/2*x
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  28. √(2^x-9^x)=√2^x x=0
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