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b]=(1/5)¹²:125⁻⁴=5⁻¹²;5⁻¹²=1
c] log₃9+log₂8=2+3=5
d]2log√3+3log1=log√3²+log1³=log3+log1=log(3*1)=log3
2]
3x²+4x-4=0
Δ=16+48=64 x1=[-4-8]/6=-2 x2=[-4+8]/6=2/3
3a]
x=-1 x=10
x∈(-1,10)
b]
-(x²-2x+1)-5x+5≥0
-x²+2x-1-5x+5≥0
-x²-3x+4≥0
Δ=9+16=25 x1=[3-5]/-2=1 x2=[3+5]/-2=-4
x∈<-4,1>
4]
6x-2≥0
6x≥2
x≥1/3
x∈<1/3,+∞)
5]
2n+2n+2+2n+4+2n+6=44
8n=44-12
n=32/8=4
boki maja:
2n=2*4=8
2n+2=8+2=10
2n+4=8+4=12
2n+6=8+6=14