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FrostF1
@FrostF1
October 2021
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Помогите решить несколько заданий, сложновато..
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shevchenkogera
3) (5/4)^(3-х)=(5/4)^ (-2)
3-x=-2
x=5
4) cosa=BC/AB, sinB=BC/AB, cosA=sinB=1/3
5) =x³/3-6*x²/2+9x=(8/3+1/3)-3(4-1)+9(2+1)=3-9+27=21
2 votes
Thanks 2
FrostF1
Спасибо!
ewgenijbark
Verified answer
3. (5/4)^3-x=(4/5)^2
(4/5)^x-3=(4/5)2
x-3=2
x=5
4. sinB=sin(90-A)=cosA=1/3
5 не могу разглядеть
3 votes
Thanks 2
FrostF1
Спасибо, выручили!
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Answers & Comments
3-x=-2
x=5
4) cosa=BC/AB, sinB=BC/AB, cosA=sinB=1/3
5) =x³/3-6*x²/2+9x=(8/3+1/3)-3(4-1)+9(2+1)=3-9+27=21
Verified answer
3. (5/4)^3-x=(4/5)^2(4/5)^x-3=(4/5)2
x-3=2
x=5
4. sinB=sin(90-A)=cosA=1/3
5 не могу разглядеть