2у-7=7+7,2у-3,6
2у-7=3,4+7,2у
2у-7,2у=3,4+7
-5,2у=10,4
у=-2
4 5/6х-2 5/6х=24;
2х = 24,
х = 12,
3 1/8*2/5*1 1/15 = 25/8 * 2/5 * 16/15 = 4/3= 1 1/3;
(4 1/5-3 1/3)*3 3/4+1/4 =
= (21/5-10/3)*15/4+1/4 =
= (63/15-50/15)*15/4+1/4 =
= 13/15*15/4+1/4 =
= 13/4+1/4 =
= 14/4 = 7/2 = 3 1/2,
9 2/3*1,2+2 2/3*1,2-2 1/3*1,2 =
= 1,2*(9 2/3+2 2/3-2 1/3) =
= 1,2 * 9 3/3 =
= 1,2 * 10 = 12
1)0,2*(7-2y)=2,3-0,3*(y-6)
1,4-0,4y=2,3-0,3y+1,8
-0,4y+0,3y=2,3+1,8-1,4
-0,1y=2,7
y=2,7/(-0,1) y=-27
2)0,2*(8-3y)=3,2-0,8(y-7)
1,6-0,6y=3,2-0,8y+5,6
-0,6y+0,8y=3,2+5,6-1,6
0,2y=7,2
y=7,2/0,2 y=36