Вычислите: 1) 2/3: (-2) 4) 4: (-1/2) 7) (-5/6) : (-5/12) 10) (-8 2/5) : 7 2) (-3/4) : 1 1/2 5) 5: (-5/8) 8) - 3 3/4:1 1/2 11) (-7 1/2) : (-5) 3) - 4/5:8 6) (-6) : (-3/5) 9) 1 7/9: (-2 2/3) 12) 4 2/3: (-1 1/6)

Question

Мария Никифорова

Математика

23 июля, 16:57

Вычислите: 1) 2/3: (-2) 4) 4: (-1/2) 7) (-5/6) : (-5/12) 10) (-8 2/5) : 7 2) (-3/4) : 1 1/2 5) 5: (-5/8) 8) - 3 3/4:1 1/2 11) (-7 1/2) : (-5) 3) - 4/5:8 6) (-6) : (-3/5) 9) 1 7/9: (-2 2/3) 12) 4 2/3: (-1 1/6)

+2

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Артемий Марков · Answer 1

1) 2/3 : (-2) = - 4/3;

4) 4 : (-1/2) = 4 * (-2/1) = - 8;

7) (-5/6) : (-5/12) = (-5/6) * (-12/5) = 2;

10) (-8 2/5) : 7 = - 8 2/5 * 1/7 = - 42/5 * 1/7 = - 6/5;

2) (-3/4) : 1 1/2 = - 3/4 : 3/2 = - 3/4 * 2/3 = - 1/2;

5) 5 : (-5/8) = 5 * (-8/5) = - 8;

8) - 3 3/4 : 1 1/2 = - 15/4 : 3/2 = - 15/4 * 2/3 = - 5/2 = - 2 1/2;

11) (-7 1/2) : (-5) = - 7 1/2 * (-1/5) = - 15/2 * (-1/5) = 3/2 = 1 1/2;

3) - 4/5 : 8 = - 4/5 * 1/8 = - 2/5;

6) (-6) : (-3/5) = - 6 * (-5/3) = 10;

9) 1 7/9 : (-2 2/3) = 16/9 : (-8/3) = 16/9 * (-3/8) = - 2/3;

12) 4 2/3 : (-1 1/6) = 14/3 : (-7/6) = 14/3 * (-6/7) = - 4.