А)14 + 5х = 4х + 3х
5x-4x-3x=-14
-2x=-14
x=7
б)3а + 5 = 8а - 15
3a-8a=-15-5
-5a=-20
a=4
в)4х + 12 = 3х + 8
<span>4x-3x=8-12
x=-4
г)5у + 27 = 4у + 21
5y-4y=21-27
y=-6</span>
(2,8-x)=1,5
x=1,3
Вот и все
<u>1; 1 1/2; 2; 2 1/2; 3; 3 1/2; 4; 4 1/2 ; 5; 5 1/2.</u>
1 + 1 1/2 + 2 + 2 1/2+ 3+ 3 1/2 + 4+ 4 1/2 + 5 + 5 1/2 =
1 + 1 + 2 +2 +3 +3 + 4 + 4 + 5 + 5 + (5 * 1/2) = 30 + 2 1/2 = <u>32 1/2</u>