<span>m(t) = m0·2</span><span>^(−t/T)</span>
<span>m0=200 <span>мг
</span></span><span>T=3 мин
</span>m(t) = <span>25 <span>мг
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t - ?
Подставляем в формулу </span></span><span>m(t) = m0·2<span>^(−t/T) </span>значения </span>m0, Т и m(t) :
<span>25 = 200·2</span><span><span>^(</span><span>− t/3)
</span></span>25 = 200/2<span>^(t/3)</span>
2<span>^(<span>t/3) = 200/25
</span></span>2<span>^(t/3) = 8</span>
2<span>^(<span>t/3) = 2³
</span></span><span>t/3 = 3
</span><span>t = 9
Ответ: 9 минут
</span>
Cos^4t+sin^4t=(cos^4t+cos^2t*sin^2t+sin^4t)-2cos^2t*sin^2t=(sin^2t+cos^2t)^2-1/2(2cost*sint)^2=1-1/2sin^2*2t
А/(а²-b²) : a/(ab+b²)=a/(a+b)(a-b) * b(a+b)/a=b/(a-b)
если a=1.1, b=0.6, то
0,6/(1,1-0,6)=0,6/0,5=6/10 :5/10=6/10*10/5=6/5=1 1/5=1,2
Подкор(2*8) - подкор2*6=
=Подкр 16 - подкор 12=
=4-подкр (4*3)=4-2подкор3