Если d=5, c=0,2, то
(2с-4)/(dс-2d)=2(с-2)/d(c-2)=2/d=2/5=0,4
7^[x]=8....................................................................................
x=log7(8)
<span>1<=2-x< 5 1/3
1-2<=-x<5 1/3 -2
-1<=-x<3 1/3
1=>x>-3 1/3
-3-2-1+0+1=-5
</span>
1/6*√144+1/3*√0,81=1/6*12+1/3*0,9=2+0,3=2,3