0,6(х+1 2/3)=-1,2
0,6х+0,6*5/3=-1,2
0,6х+3/5*5/3=-1,2
3/5х+1=-6/5
3/5х=-6/5-1
3/5х=-11/5
х=-11/5:3/5
х=-11/3
х=-3 2/3
11 * 9 * 5 = 11 * 45 = 495
Если умножить на 2 , то :
6x-8a=2x+4a
4x=12a
x=3a
(9,5-3 3/5+5,5-6 13/15)(2 5/12+1 1/3)=
(15-9 22/15)(3 9/12)=
(15-10 7/15)(3 3/4)=
4 8/15*3 3/4=(68*15)/(15*4)=17.