27t³−516t³+80t+100
Здесь нет ограничений t-любое число
(log5(2)+log2(5)+2)*(log5(2)-lg2)*log2(5)-log5(2)=
1ая скобка (log5(2)+log2(5)+2)=(log5(2))^2+1+2log5(2)) / log5(2)
2ая скобка (log5(2)-lg2)=1 / log2(5)-1 / (log2(5)+1)=(log2(5)+1-log2(5)) / (log2(5)*(log2(5)+1)=1 / (log2(5) * (log2(5)+1)
3 действие log2(5) * 1 / (log2(5)*(log2(5)+1)=1 / (log2(5)+1) = log5(2) / (1+log5(2))
4 действие (log5(2))^2+1+2log5(2)) / log5(2) * log5(2) / (1+log5(2))=
(log5(2))^2+1+2log5(2)) - квардрат суммы
= (log5(2)+1)^2 / (log5(2)+1) = log5(2)+1
log5(2)+1-log5(2) = 1
Ответ: 1.
<span>0.5y-1 (-2y+4)=y
0,5у+2у-4=у
1,5у=4
3у/2=4
3у=8
у=8/3
у=2целых2/3.</span>
3ctgx -√3=0
3ctgx=√3
ctgx=<u>√3</u>
3
x=π/3 + πn, n∈Z
Ответ: х=π/3 + πn.
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