5,3b-6-5*(3,7b-0,7)
5,3b-11*(3,7b-0,7)
5,3b-40,7b+7,7
-35,4b
-35,4*3/4=18,85
3x²-3х-5<span>≥75
</span>x²<span>≥25
</span>х1<span>≥5
х2</span><span>≥-5
8х-</span>x²<span>>0
х(8-х)>0
х>0;8-х>0
-х>-8
х<8
-</span>x²-4х+5<span>x²<0
</span>4<span>x²-4х<0
</span>4х(х-1)<0
4х<0;х-1<0
х<0; х<1
2x²-3х-5<span>≤0
Д=9-4*2*(-5)=9+40=49
х1,2=3+7
------
4
х1=2,5
х2=-1</span>
243*262144*625*16 / 102400000*1728 = 637009920000 / 1769472000000 = 3.6