5х+8=0
5х=-8
х=-8/5=<em>-1,6</em>
1)4,3*6z=25.8z
2)4.3*300=1290
25.8z-25.8z-25.8z=-1290
25.8z=1290
z=1290/25.8=50
В)-0,8 + (7-0,9+2,3)= -0,8 + 8,4= 7,6
Г)3,2-(0,9 + 2,3 - 6)= 3,2 - 2,8= 0,4
1/5(0,2) ; 1/4(0,25) ; 1целая 1/5(=6/5=1,2) ; 3/2 (1,5); 2целых 3/4(=11/4=2,75)
<span>999 * 999 - 999* 989 - 9990 = </span>999 * 999 - 999* 989 - 999*10 =
= 999(999 - 989 - 10) = 999 * 0 = 0