ax^2-cx^2-cx+ax-a+c=x^2(a-c)+x(a-c)-(a-c)=(a-c)(x^2+x-1)
= решение = решение = решение = решение = решение =
Ответ: x∈[2.6; знак бесконечности)
8x2 + 10x - 3 = 0
D = b2 - 4ac
D = 100 + 96 = 196 = 14^2
(5x+y)/(x-5y) + (5x-y)/(x+5y)÷(x²+y²)/(x²-25y²)=
=[(5x+y)(x+5y) + (5x-y)(x-5y)]/(x²+y²)<span>÷(x²+y²)/(x²-25y²)=
=[5x</span>²+25xy+5y²+xy+5x²+xy-25xy+5y²](x²-25y²)/(x²+y²)(x²-25y²)=
=сокращаем, получаем=
=(10x²+10y²)/(x²+y²)=10<span>(x²+y²)/(x²+y²)</span>=10