4 5/6 х-2 5/6 х=24 розвязати ривняння? Обчислити: 3 1/8*2/5*1 1/15; (4 1/5-3 1/3) * 3 3/4+1/4; 9 2/3*1,2+2 2/3*1,2-2 1/3*1,2.

4 5/6 х-2 5/6 х=24;

2 х = 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