Вычислите А) (-2/3)2*(-1 1/8) б) 21/26:(- 1 1/2)

А) (-2/3) * 2 * (-1 1/8) = 2/3 * 2 * 1 1/8 = 2/3 * 2 * (1 * 8 + 1)/8 = 4/3 * 9/8 = (4 * 9)/(3 * 8) = 9/(3 * 2) = 3/2;

Ответ: 3/2.

б) 21/26 : (-1 1/2) = -21/26 : (1 * 2 + 1)/2 = -21/26 : 3/2 = -21/26 * 2/3 = -(21 * 2)/(26 * 3) = -(7 * 2)/26 = -7/13.

Ответ: -7/13.