Tg t/(tg t + Ctg t) = ?
a)tg t = Sin t/Cos t
б) tg t + Ctg t = Sin t/Cos t + Cos t /Sin t = (Sin² t + Cos ²t)/Cos t Sin t= 1/Cos tSin t
в) Sin t/Cos t : 1/Cos tSin t = Sin t /Cos t ·Cos t Sin t /1= Sin²t
1)3(y-1)²+6y=3(y²-2y+1)+6y=3y²-6y+3+6y=3y²+3
2)8c+4(1-c)²=8c+4(1-2c+c²)=8c+4-8c+4c²=4+4c²
3)4ab+2(a-b)²=4ab+2(a²-2ab+b²)=4ab+2a²-4ab+2b²=2a²+2b²
4)3(x+y)²-6xy=3(x²+2xy+y²)-6xy=3x²+6xy+3y²-6xy=3x²+3y²
5)27.3ˇ4=3ˇ3.3ˇ4=3ˇ7=3.3.3.3.3.3.3=9.9.9.3=729.3=2187
6)(a³.b².c)ˇ4=aˇ12 . bˇ8 .cˇ4
256^(1/7)*x^(1/7)-512^(1/7)*x^(2/7)+4=0
256^(1/7)*x^(1/7)*(1-2x^(1/7))+4=0
(256*x)^(1/7)*(1-2x^(1/7))+4=0
4^(4/7)*x^(1/7)*(1-2x^(1/7))+4=0
((16x)^(1/7)-4)^2=0
(16x)^(1/7)=4
X^(1/7)=4/(4^(2/7))
X^(1/7)=4^(5/7)
Дальше не знаю
1) 8,35*10^8*6,7*10^3=55,945*10^11
2)2/7=0,2857 0,3-0,2857=0,0143
3) 2194,8375=2194,84
|2194,8375-2194,84|=0,025
4)0,0000384=3,84*10^-5
1725000=17,25*10^5
Вроде так, извини если что)