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NO1uW[J[v @07/23 @@
1620Ş óM XV 8/13
uW[J[v @ 07/24 @@
0341Ş óM XV 8/13
uW[J[v @ 07/25 @@
1121Ş óM XV 8/13
uW[J[v @ 07/26 @@
2203Ş óM XV 8/13
uW[J[v @ 07/31 @@
2248Ş óM XV 8/13
ČăĚúÉđđńšçęÜľ˝BĄńąęçđÜĆßĊ⡾ܾ˝Bńšçę˝âčĚđš
NOQuX[N}v 07/2V 1348Ş@ óM XV 8/13
(1)
(sin(x)+2sin(y))/(cos(x)+2cos(y)+6)
f(x)=sin(x)/(cos(x)+2)ơéĆ
^Ž=f(x)@ĆŻś
ff(x)=(sin^2(x)+cos^2(x)+2cos(x))/(cos(x)+2)^2
=0
2cos(x)=-1
Socx=2Î/3
Soc
Max{f(x)}=(ă3/2)/(-1/2+2)=ă3/3
(2)
(4sinĆ+2cosĆ+5)/(cosĆ+sinĆ+1)
ČşĚć¤ÉuĆA
tan(Ć/2)=tc-Î/4<Ć<Î/2c-1<t<♾️
cosĆ=(1-t^2)/(1+t^2)
sinĆ=2t/(1+t^2)
^Ž=(3t^2+8t+7)/(2t+2)
((3t^2+8t+7)/(2t+2))f=(3t^2+6t+1)/(2(t+1)^2)
3t^2+6t+1=0
t=(-3-ă6)/3, (-3+ă6)/3
ăŇĚĆŤA
^Ž=(2t+6)/(2t+2)=(t+3)/(t+1)=6+ă6)/ă6=1+ă6
Soc
Min{^Ž}=1+ă6=3.449c
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uX[N}v 08/01
2255Ş@ óM XV 8/13
ÇÁâčQ
A,B,CĚÂmŚđťęźę
P(A),P(B),P(C)ơéĆA
P(A)=(1/6)(1+(5/6)^5)*(1/(1-(5/6)^6)
=(6^5+5^5)/(6^6-5^6)
=10901/31031
=991/2821 =0.3512c
P(B)=(1/6)((5/6)+(5/6)^4)*(1/(1-(5/6)^6)
=(5*6^4+6*5^4)/(6^6-5^6)
=10230/31031
=30/91 =0.3296c
P(C)=1-991/2821-30/91=900/2821 =0.3190c
P(A)>P(B)>P(C)
żČÝÉA
ABCĚÔĚęc
P(A)+P(B)+P(C)=1
P(B)=(5/6)P(A)
P(C)=(5/6)^2P(A)
Soc
P(A)(1+5/6+(5/6)^2)=1
P(A)=6^2/(6^2+6*5+5^2)=36/91
P(B)=30/91
P(C)=25/91
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0040Ş@ óM XV 8/13
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