1)
8 (5/8 + 3/8 а) = 8/1 * 5/8 + 8/1 * 3/8 *а =
= (8*5)/(1*8) + (8*3)/(1*8) * a = 5 + 3а
(7/9 с - 11/18 ) * 18 = (7*2)с - 11 = 14с-11
2)
1/3 ( 6/7 а + 3/4 ) = 1/3 * 6/7 * а +1/3 * 3/4 = 2/7 а + 1/4
4 1/2 ( х- 3/5 ) = 9/2 * х - 9/2 * 3/5 =
=4 1/2 *х - 27/10 = 4,5х - 2,7
3)
15 * (5/6 t - 7/18 s +1/30 ) =
= 15/1 * 5/6 t - 15/1 * 7/18 s + 15/1 * 1/30 =
= 75/6 t - 105/18 s + 1/2 =
= 12.5t - 5 15/18 s + 0.5
1 1/6 (2x + 5/14 y -1 1/2 ) =
= 7/6 * 2x/1 + 7/6 * 5/14 y - 7/6 * 3/2 =
= 7/3 x + 5/12 y - 7/4 =
= 2 1/3 x + 5/12 y - 1 3/4