Пошаговое объяснение:
1.
а) -3 * (-1. 1/9) = -3 * (-10/9) = 30/9 = 3. 3/9 = 3. 1/3
б) -0,3 * 1/2 = -0,3 * 0,5 = -0,15
2.
а) 13,13 : 1. 2/11 = 13. 13/100 : 1. 2/11 = 1313/100 : 13/11 = 1313/100 * 11/13 = 101/100 * 11/1 = 1111/100 =
11. 1/100 = 11,11
б) 0,69 : 13/14 = 69/100 : 13/14 = 69/100 * 14/13 = 69/50 * 7/13 = 483/650
3.
а) (2,2)² + (-0,2)² = 4,84 + 0,04 = 4,88
б) (-1/4 + 3/4)² = (2/4)² = (1/2)² = 1/4
4.
а) 2,1 + 1. 7/30 - (4 - 2,9)=
1) 4 - 2,9 = 1,1
2) 2,1 + 1. 7/30 = 2. 1/10 + 1. 7/30 = 2. 3/30 + 1. 7/30 = 3. 10/30
3) 3. 10/30 - 1,1 = 3.
10/30 - 1. 1/10 = 3. 10/30 - 1. 3/30 = 2. 7/30
б) 4,7 + 2/3 + 1. 3/5 + 3,3 =
1) 4,7 + 3,3 = 8
2) 2/3 + 1. 3/5 = 10/15 + 1. 9/15 = 1. 19/15 = 2. 4/15
3) 2. 4/15 + 8 = 10. 4/15
