2)-5/9 *0,87 + (-5/9) * 1,83=-5/9(0,87+1,83)=5/9*2,7=5/9*27/10=3/2=1,5
3)9/37=0,24
1 3/28=31/28=1,11
4)(-4х-3) (3х+0,6)=0
-12х²-2,4х-9х-1,8=0
-12х²-11,4x-1,8=0
D=129,96-4*12*1,8=129,96-86,4=43,56;√43,56=±6,6
x1=(11,4-6,6)/(-24)=4,8/(-24)=-0,2
х2=(11,4+6,6)/(-24)=18/(-24)=-0.75