221х²-60х+4=0
D=3600-16*221=64
х1=(60+8)/442=34/221 х2=52/442=26/221
(2+3*(-1.1))*(5-(-1.1)-(2-3*(-1.1)(5-1.1)=(5.3*(-5.5)-(-1.3*-5.5)=29.15-7.15=22
3/4x=12
4x=12/3
x=1
9-0,2x=1
0,2x=9-1
x=40
6x-1=2x-9
6x-2x=1-9
4x=-8
x=-2
5а-b+5a^2-ab=(5a+5a^2)-(b+ab)=5a(1+a)-b(1+a)=(1+a)(5a-b)