Question

пжпжжжжж решите 50 баллов дам​

Answer 1

Пошаговое объяснение:

№1

1) 3/4 - 4/5 = 15/20 - 16/20 = -1/20

2) -1/20 * 7,8 = -0,05 * 7,8 = -0,39

3) 2/3 + 4/7 = 14/21 + 12/21 = 26/21

4) 26/21 * (-7/13) = 2/3 * (-1/1) = -2/3

5) -0,39 - (-2/3) = -39/100 + 2/3 = -117/100 + 200/300 = 83/300

№2

1) 3/7 - 16/21 = 9/21 - 16/21 = 7/21 = 1/3

2) 1/3 * (-2 2/7) = 1/3 * (-16/7) = -16/21

3) 11/15 + 0,3 = 11/15 + 3/10 = 22/30 + 9/30 = 31/30

4) 31/30 : (-12 2/5) = 31/30 : (-62/5) = 31/30 * (-5/62) = 1/6 * (-1/2) = -1/12

5) -16/21 + (-1/12) = -64/84 + (-7/84) = -64/84 - 7/84 = -71/84