Comments by "Fhf Fhf" (@fhffhff) on "Рабкор" channel.

  1. (±1;0)(±1;-1) k=3k1±1 4p(p+1)=(3k1±2)k1 p=1,k1=-+2 k=-+5 p=-2 (1;-5)(-2;5)
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  2. a(n+1)=2^na1-(2^n-1) an=2^(n-1)+1 n>1+log2(-0,5+√(10¹⁵+0,25))=1+log2(-0,5+2²⁴+2²³+2²²+2²¹-2¹⁵+2¹⁴-2¹²-2⁹-2⁷)=25,.. n=26
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  3. 2/(1-tg²a)/>°/>(0;π/6) max=3
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  4. (5-4/3а)*3/4=15/4-а S∆=0,5*5*15/4=75/8(cm²)
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  5. X²+y²/a²=1,y=2ax-3a (2x-3)²+x⅔=1 5x²-12x+8=0 x=(12±4i)/10× y=-0,5/a(x-x0)+2ax0-3a (1+0,25/a⁴)x²-1/a² x((0,5/a²+2)x0-3)+(0,5a-²+2)²x0²-6 (0,5/a²+2)x0+8=0 x=x0+a²(-3±√(-(1+4a²)²x0²+4(3a²+12a⁴)x0-32a⁴+1))/(2a⁴+0,5) min=|a|√ (a²+0,25)|-3+√(-(1+4a²)²(x0-6a²/(1+ 4a²))²+4a⁴+1)|/2/(a⁴+0,25) x0[-1;1] -1,5/(1+4a²)+1,5≤1,5,≥0 x0[0;1] ±√(-1/4-3/8/(x0-1,5))=a≤√2/2 √(a⁴+0,25a²)(1,5/(a⁴+0,25)-(a⁴+0,2 5)-⁰,⁵) (a⁴+0,25a²)-⁰,⁵(-3a⁶-1,125a⁴+ 0,75a²+3/32+(-0,5a²+0,25a⁴-1/16)(a⁴+0,25)⁰,⁵)(a⁴+0,25)-²a=0 [a=0,{|a|≤√(-1/8+1/4√(19/3)cos(1/3arccos(-√(27/19³)))),(11a⁶+6,5a⁴-2,75a²-3/8)(13a⁶+2,5a⁴-3,25a²-3/8)=(0,5a⁴-a²-1/8)²;a=±√0,32*0+*√0,32->a min=0
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  6. Xy+16/(xy)+10≥2*4+10=18,xy=4
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  7. S∆=15(cm²)
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  8. c=6270/(ab(6a²+2ab+3b²)),a,b,c≥2 a=10,c=627/(b(600+20b+3b²))× a=11,c=570/(b(726+22b+3b²)×
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  9. 1+19+199+1999=2218
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  10. 10²⁰⁰-3*10¹⁹⁰+..+3²⁰-3²¹/(10¹⁰+3) 1+460'353'200/10'000'000'003 1+1=2✓
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  11. 0;1;2;3=2;1 1 или 2 числа нечетны, остальные четны. d≤n/4,a≥b≥c≥d,a+b+c+d≤n a²+b²+c²+d²=n²-6,n≥3 n=3,(1;1;1;0)(1;1;0;-1)(1;0;-1;-1)(0;-1;-1;-1) n=4,(2;2;1;±1)(2;2;-1;-1)(2;1;±1;-2)(1;±1;-2;-2)(-1;-1;-2;-2) Почти для всех n.
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  12. 16+x²-2x(-1;3)=16+3-3=16
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  13. √3/3=2x/(x²+3) √3/3x²-2x+√3=0 x=√3 1/sina=√3/sin(150°-a) √3/3=tga,a=30°
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  14. nm+1=3n m=3-1/n>0 n=1 m=2 P(x)=kx+b $(0;x)(kx+b)²dx=kx³ (kx+b)³/3/k(0;x)=x((kx+b)²+(kx+b)b +b²)/3 (k²-3k)x²+3kxb+2b²=0{k=0;3,[k=0,b=0;b=0;P(x)=0;3x
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  15. k(x^(1+2/n)-2^(1/n)x^(1/n))=2(x³+x) 1+1/n=2,n=1 k(x³-2x)=2(x³+x) x(f(x²)-2x²-2)=f(2x) (e^(x²/4)+e^(-x ²/4)-2)/x-x=f(x) En=1;∞(2^(4n+1) 1)/4^2n/(2n)!/(4n+1)-1,5 A)
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  16. X¹,⁵=√(55±12√21)=2√7±3√3 x⁴,⁵=218√7±333√3 (218√7±333√3)/(218√7±333√3)/436/√7=√7/3052
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  17. (√(x+4,2)-2)(√(x+4,2)-1/2)/√(x+4,2) ≤0 °-4,2+*-3,95-*-0,2+>x x[-3,95;-0,2]
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  18. $(0;ln2)2(x-ln2)(1+e^x)-²e^xdx=-2 (x-ln2)*(1+e^x)-¹+2(lne^x-ln(1+e^x))(0;ln2)=-2ln3+5ln2
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  19. 0,25(-S0/S√(2g)t+c)²=h c=2√H h=0,25(-S0/S√(2g)t+2√H)² T=10(ч) (S0/S)²g*648*10⁶=H h'/(S0/S√(2g)* 18*10³-√h)=S0/S√(2g) √h=z,h=z², h'=2zz' √h+S0/S√(2g)*18*10³ln|√h- S0/S√(2g)*18*10³|=-S0/S√(0,5g)t+ S0/S√(2g)*18*10³ln|S0/S√(2g)*18 *10³|, h=(S0/S)²g*648*10⁶, 36*10³(-1+∞+ln|S0/S√(2g)*18*10 ³|)=t,t=86,3ч(?)
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  20. $(-π;π)f(t)dt=c f(0)=0 f'(x)=sinx+c f(x)=-cosx+cx+c1 0=-1+c1 c1=1 f(x)=-cosx+cx+1 -sinx+cx²/2+x(-π; π)=2π=c f(x)=-cosx+2πx+1
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  21. aZ,a:3 a=3n+1✓ a=3n+2 1=2×{3n;3n+1,nZ}
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  22. A1=3,an=S(n-1)/(n-1)+n*2^n=1+(n+1)*2^n
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