1081. 1) 3,8 * (-0,5) - 1,8 * (-0,5) = -0,5 * (3,8 - 1,8) = -0,5 * 2 = -1
2) -3 2/9 * 2,7 - 3 2/9 * (-6,3) = -3 2/9 * (2,7 - 6,3) = -3 2/9 * (-3,6) = 29/9 * 36/10 = 116/10 = 11,6
3) -5/8 * 4/7 + 1/8 * 4/7 = 4/7 * (1/8 - 5/8) = 4/7 * (-4/8) = -2/7
4) 9/17 * 2,1 - 2,1 * (-8/17) = 2,1 * (9/17 + 8/17) = 2,1 * 1 = 2,1
1082. 1) (-2 3/7 - 1 5/7) * 28 = -2 3/7 * 28 - 1 5/7 * 28 = -68 - 48 = -116
2) (2 3/5 - 4 1/4) * 20 = 2 3/5 * 20 - 4 1/4 * 20 = 52 - 85 = -33
3) 3 1/7 * (1 3/11 - 2 5/22) = 1 3/11 * 3 1/7 - 2 5/22 * 3 1/7 = 14/11 * 22/7 - 49/22 * 22/7 = 4 - 7 = -3
4) 2 7/9 * (-2 4/25 + 4 8/25) = 4 8/25 * 2 7/9 - 4 8/25 * 2 7/9 = 25/9 * 108/25 - 54/25 * 25/9 = 12 - 6 = 6
Надеюсь, что помогла