4)
16х^2+8х-6х-3=16х^2-8х+1
16х^2+2х-3=16х^2-8х+1
16х^2+2х-16х^2+8х=1+3
10х=4
х=4÷10
х=0.4
₩₩₩₩₩₩₩₩
2а)
=а^2+3а-а-3-а^2-2а-1=-4
2б)
=(х^2-у^2)(х^2+у^2)=х^4-у^4
₩₩₩₩₩₩₩₩₩
1)
(3.17-1.17)^2
=---------------------------------=
(6.75-3.25)(6.75+3.25)
2^2
=---------=4/35
3.5×10