Comments by "Fhf Fhf" (@fhffhff) on "МИСТИЧЕСКИЕ ПРАКТИКИ" channel.

  1. 3/5R=6cm l=√(10²-6²)=8 QR=16cm
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  2. 3a+11b=31, a>0,b>0 a=11a1+...,b=3b1+... a=3,b=2 {a=11a1+3,b=-3a1+2; a1≥1,b≤-1 a1≤-1,b≥5 5✓
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  3. (1/√2-1/√3)(1/√6+1/3)=1/2/√3+1/3/√2-1/3/√2-1/3/√3=1/6/√3
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  4. {5/(x-√2)+2/(x+√2y)=1, 1/(x-√2)-5/(x+√2 y)=2;{5/(x-√2)+2/(x+√2y)=1, 1/(x+√2y)=- 1/3;{1/(x-√2)=1/3,1/(x+√2y)=-1/3;{x=3+ √2,y=-3√2-1.
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  5. (x+2/3)/(x+1)/(x+0,5)/(x+2)<0+-2°-1-°+-2/3°-°-0,5+>x x(-2;-1)U(-2/3;-0,5)
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  6. y=7x/3-x'/3 y'=10x-4y, 7/3x'-1/3x''=10x-2 8/3x+4/3x',-1/3x''+x'-2/3x(t)=0, 1/3k²+k 2/3=0,k=(-1±1/3)/(-2/3)[k=1,k=2;x(t)0=c1e ^t+c2e^2t,y=2c1e^t+5/3c2e^2t
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  7. y''-2x/(x-1)²y+n(n+1)y/(x-1)²=0 (u'-x/(x-1)²)' +(u'-x/(x-1)²)²=-(n²+n-2)/(x-1)²-1/(x-1)⁴ z-¹/ 1+x=c,z=1/(x-c) zp=a(-1)x-¹+a(-2)x-² {a(-1) =0,5±√(-n²-n+2,25),[a(-2)=0,a(-1)=1; a(-2)= ±i;z=x-¹±ix-² [u'=1/(x-1)+1/(x-1)²+1/(x-c), u'=1/(x-1)+1/(x-1)²+x-¹±ix-²;[u=ln|x&1|+(x 1)-¹/-1+ln|x-c|+c1,u=ln|x-1|+(x-1)-¹/-1+ln|x|±ix-¹/-1+c1;[y=(x-1)e^(-1/(x-1))(x-c)c1,y=(x- 1)e^(-1/(x-1))x(c1sin(1/x)+c2cos(1/x).)
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  8. √(x-y+1)²=|x-y+1|=|1111-(-909)+1|=2021
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  9. z=x²-xy+2y²+3x+2y+1 x=0,y=0,y=-x-5 z'(x)=2x-y+3=0 x=0,5y+1,5 z'(y)=-x+4y+2 =0 y=x/4-0,5 x=0,5(x/4-0,5)+1,5 x=1,25/(7/8)=10/7 y=-1/7 (10/7;-1/7) *+>x*+>y min(10/7;-1/7) z(0;0)=1,z(-5;0)=9 z(0;-5)= 41 4x²+26x+41=4(x+3,25)²-5/4≥-1,25
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