4y + 2 - y - 1 = 16
3y + 1 = 16
3y = 15
y = 5
<span>a) 2√3 =</span><span>√12
</span>б) 11√5=<span>√605
</span><span>в) x√7, если x>0
</span>x√7=√7x^2
<span>(1-sinb)(1+sinb)+(1+cosb)(1-cosb)=
=1-sin²b+1-cos²b=2-(sin²b+cos²b)=2-1=1</span>
1. S8=5/32; q=–0,5
S8=b1*(q^8–1)/(q–1)=b1*(-255/256)/(–1,5)=b1*(-255*2/256*(-3)=b1*(510/768)
b1*(510/768)=5/32
b1=(5*768)/(32*510)=24/102=12/51
2. y1=0,55; y2=0,44
q=y2/y1=0,44/0,55=0,8
S4=y1*(q^4–1)/(q–1)=0,55*(-0,5904)/(-0,2)=1,6236