...........................................................................
=
16х²-24х+9-49=0
16х²-24х-40=0 :8
2х²-3х-5=0
Д=9+2*4*5=49=7²
х1=3-7/4=-1
х2=3+7/4=2,5
1. 1/4+1/5+1/25=9/20+1/25=49/100 2. 1/9-1/6+1/16=-1/18+1/16=1/144
3. 4/25-2/3+25/36=-38/75+25/36=169/900
4. 25/64+3/4+9/25=1 9/64+9/25=1 801/1600
Пропорция: 320/100=400/X 1)320X=40.000 2)X=125
-1+(-a+√a)a/√a+√a
-1+-a²+a√a/2√a
-a²-1+a√a/2√a
-√aa²-√a*1+√aa√a/2*a
-a²√a-√a+√a√a/2a
-a²√a-√a+aa/2a
a²-a²√a-√a/2a