(9b^2-4x^2)=(3b-2x)(3b+2x)
S=b1/(1-q)
12=b1(1+1/2)
12=b1*1,5
b1=12/1,5=8 b2=b1*q=8*(-1/2)=-4
b1-b2=8-(-4)=8+4=12
<span>у=-0.5х^2+3х+2
</span><span>у'=-2*0.5х+3=x+3
<span>-x+3=0
x=3
y(3)=-9/2+9+2
Ymax=</span></span>-13/2
Lg32=lg(2^5)=5lg2; lg(0.5)=lg(1/2)=lg(2^(-1))=-lg2
lg32/lg0,5=5lg2/(-lg2)=-5