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kiss230501
@kiss230501
July 2022
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решите,пожалуйста.Очень нужно
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Vas61
1.область допустимых значений (одз) x²+x>0 x(x+1)>0 x∈(-∞;-1)∪(0;+∞)
㏒0,5(x²+x)=-1×㏒0,5(0,5) 0,5=5/10=1/2
㏒0,5(x²+x)=㏒0,5(1/2)^-1
㏒0,5(x²+x)=㏒0,5(2)
x²+x=2
x²+x-2=0
x1+x2=-1 x1×x2=-2 x1=-2 x2=1 -2∈одз и 1∈одз
2.(1+tgα+tg²α)/(1+1/tgα+1/tg²α)=(1+tgα+tg²α)/(tg²α+tgα+1)/tg²α=(1+tgα+tg²α)tg²α/(tg²α+tgα+1)=tg²α
3.2^(-x/2)≤2^7
2>1 -x/2≤7
x≥-14
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Answers & Comments
㏒0,5(x²+x)=-1×㏒0,5(0,5) 0,5=5/10=1/2
㏒0,5(x²+x)=㏒0,5(1/2)^-1
㏒0,5(x²+x)=㏒0,5(2)
x²+x=2
x²+x-2=0
x1+x2=-1 x1×x2=-2 x1=-2 x2=1 -2∈одз и 1∈одз
2.(1+tgα+tg²α)/(1+1/tgα+1/tg²α)=(1+tgα+tg²α)/(tg²α+tgα+1)/tg²α=(1+tgα+tg²α)tg²α/(tg²α+tgα+1)=tg²α
3.2^(-x/2)≤2^7
2>1 -x/2≤7
x≥-14