Question

Срочно ...............

Answer 1

1) (120+80)/10000= 200/10000= 1/50

2) x²-4x+1>0

D=16-4= 12

x1= (4+2√3)/2= 2+√3

x2= 2-√3

x∈(-∞;2-√3)∪(2+√3;+∞)

x²-4x+1=8

x²-4x-7=0

D= 16+28= 44

x1= (4+2√11)/2= 2+√11

x2= 2-√11

2+√11+2-√11= 4