-10+6x=7x+3
6x-7x=3+10
-1x=13
x=13:(-1)
x=-13
Sin2T=2sinTcosT
Sin2t/cost-sint=2sinTcosT/cosT - sinT=2sinT-sinT=sinT
<span>.b3=54 b5=6 Найти:S6
b5/b3=b1q^4/b1q^2=q^2=6/54=1/9
b1=54*9
q=1/3
s6=b1(1-q^6)/(1-q)=54*9(1-1/729)*3/2=2*3*9(728/729)*3/2=728/9
q=-1/3
S6=54*9(1-1/729)*-3/4=-364/9</span>