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

  1. √(25-n)+2√n 0,5(25-n)^-0,5*-1+n^-0,5=0, -n⁰,⁵+2(25-n)⁰,⁵=0,4(25-n)=n,n=20 +*->n max=√5+2√20=5√5
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  2. 2013/7=286 1/7 286+√2sin(π/28)/|sin(2π/7)-cos(2π/7)|=287
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  3. u"(x)-u²(x)+u⁵(x)=0 u(x)=e^y y'²+y''-e^y +e^(4y)=0, y=0, u(x)=1;0
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  4. a(n+1)=7n/(n+2(an=7n/(n+2)*7(n-1)/(n+1)...7/3a1=7^n*n!/(n+2)!*2*3,5=7^(n +1)n!/(n+2)! an=7^n/n/(n+1)
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  5. 12/11<y/x<11/10 x=21:22 10/11;23,1 y=23
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  6. Пk=0;n(1+2^(-0,5*2^k)cos(45*2^k)+i2^(-2^(k-1))sin(45°*2^k))=(1+2^-0,5)(1+i1/2)3/4(1+2^(-2^(k-1))..,k≥3 2^k=4n,n=2^(k-2) 1+1/4*-1≠0,1+2^(-2^(k -1)) limk->∞ln(1+2^(-2^k))/ln(1+2^(-2^ (k-1)))=0/0=limk->∞2^(-2^k/2)*2=0 ряд сходится
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  7. 5^(6+1+0)=5⁷ 7 0-ей
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  8. |х-1|-|х|+|2х+3|=2х+4,[{х≥1,х-1-х+2х+3=2х +4;{хє[0;1),-х+1-х+2х+3=2х+4;{хє[-1,5;0),- х+1+х+2х+3=2х+4;{х<-1,5,-х+1+х-2х-3=2х +4;[{х≥1,0=2;{хє[0;1),-2х=0;{хє[-1,5;0),0=0;{х<-1,5,-4х=6;[0/,х=0,хє[-1,5;0),0/;хє[-1,5;0]
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  9. -sinx+√3/2x=0,x=0,sinx/x=√3/2× +*0->x max=1,min=√3/16π²
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  10. log(1/4*2^√x-1)=log(√2^(√x-2)+2)-2log2 {2^(√x-2)-1=(√2^(√x-2)+2)/4,2^(√x-2)-1≥0;{√2^2(√x-2)-1/4*√2^(√x-2)-0,5=0,√x≥2;{√2 ^(√x-2)=(1/4±√(1/16-4*-0,5))/2,x≥4;{[√2 ^(√x-2)=1/8+√33/8,√2^(√x-2)=1/8-√33/8;x≥4;{√x-2=log√2(1/8+√33/8),x≥4;{x=(2+l og√2(1/8+√33/8))²,x≥4;0/
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  11. 53/75*75=53 S∆1=22cm²
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  12. EC=BE√5/2 90°-arctg(2/BE),tg(90°-arctg (2/BE))=E.../EC,E...=BE²√5/4 S∆1/S∆2= BE*2/(√5/2BE*BE²√5/4)=3,2BE^-2=0,64, BE=√5
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  13. Пk=0;∞(5^(1/2^k)+3^(1/2^k))/2 limk->∞ (5^(1/2^k)+3^(1/2^k))/2=1, сумма-0 неизвестно.limk->∞ln(5^(1/2^(k+1))/2+ 3^(1/2^(k+1))/2)/ln((5^(1/2^k)/2+3^(1/2 ^k)/2)=0/0=limk->∞(0,5ln5+0,5ln3)/(ln5+ ln3)=0,5 ряд сходится
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  14. 4^log2(x²)+4^log2(2/x²)=4, x⁴+4/x⁴=4,(x⁴)²-4x⁴+4=0,x⁴=(4±√(4²-4*4))/2=2 x=±2 ⁰,²⁵
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  15. (3x³+2)³=x/3-2/3,x=-1:x⁶(x²-x+1)+x³(x²-x +1)+1/3(x²-x+26/27)≥0,188,а других решений нет
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  16. {z=-4(x+y)/x/y,(y+z)/x/y/z=-1/24,(x+z)/x/y/z=1/24;{z=-4(x+y)/x/y,10x³-24,5x²+171 x-108+190/x=±(8 1/3x+15-60/x)√(25/36 x⁴-5/3x³+17x²-8x+16) y=(5/2x²-3x+12±3 √(25/36x⁴-5/3x³+17x²-8x+16))/x;{[x=-0,7 43,x=0,714;[y=-43,92,y=1,912,y=33,678,y= -2,494;[z=5,475,z=3,292,z=-5,721,z=-3,99 8;
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  17. h=√3/4AB=cos(90°-a),a=45° AB=2√(2/3)
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  18. a=(-b³/2+√(b⁶/4+b³/27))^(1/3)+(-b³/2-b√(27b³+4b)/6/√3)^(1/3),1 корень: b(-∞;-4^(1/3)/3)U(0;∞),2 корень:b{0}U{-4^(1/3)/3} 3 корень:b(-4^(1/3)/3;0).
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