<span> 8 x^{2} -10x+2=0
D= b^{2} -4ac=100-64=36
x1=10-6/16
x2=10+6/16
x1=4/16=1/4
x2=16/16=1</span>
уравнение
а) 2х-(6х+1)=9
2х-6х-1=9
-4х=10
х=-2,5
б) 4(1-5х)=9-3(6х-5)
4-20х=9-18х+15
-20х+18х=9+15-4
-2х=20
х=-10
в) 1,5(х-6)=1,4(х+5)
1,5х-9=1,4х+7
1,5х-1,4х=7+9
0,1х=16
х=160