Question

Решите пж 249, 250, 252 даю 100 балов

Answer 1

Ответ:

Пошаговое объяснение:

249.

А

1) 4,8 : (-1,7) = 4. 8/10 : (-1. 7/10) = 48/10 : (-17/10) = 48/10 * (-10/17) = -48/17 = -2. 14/17

2) -2. 14/17 - 0,6 = -2. 14/17 - 6/10 = -2. 140/170 - 102/170 = -2. 242/170 = -3. 72/170= -3. 36/85

3) -3. 36/85 : 0,15 =

-291/85 : 15/100 = -291/85 * 100/15 = -97/17 * 20/5 = -1940/85 = -388/17

4) -388/17 * (-0,001) =

-388/17 * (-1/1000) = -97/17 * (-1/250) = 97/4250

Б.

1) 4. 4/5 : (-4/17) = 24/5 * (-17/4) = 6/5 * (-17/1) = -102/5

2) -102/5 : 3. 2/5 = -102/5 : 17/5 = -102/5 * 5/17 = -102/17 = -6

В.

1) 4. 1/3 - 6. 1/5 = 4. 5/15 - 6. 3/15 = 4. 5/15 - 5. 18/15 = -1. 13/15

2) -1. 13/15 : 1. 1/3 = -28/15 : 4/3 = -28/15 * 3/4 = -7/5 * 1/1 = -7/5 = -1. 2/5

250.

а) -29,682 : 9,7 = -3,06

б) 0,8 : (-4/35) = 8/10 : (-4/35) = 8/10 * (-35/4) = 2/2 * (-7/1) = -14/2 = -7

в) -16 : (-8/13) = -16 * (-13/8) = -2 * (-13/1) = 26/1 = 26

252.

А

1) -48. 3/4 : 3,9 = -195/4 : 3,9 = -48,75 : 3,9 = -12,5

2) -12,5 + 8. 1/5 = -12,5 + 41/5 = -12,5 + 8,2 = -4,3

3) -4,3 * (-6,3) = 27,09

Б

1) 0,2 - 7/15 = 2/10 - 7/15 = 6/30 - 14/30 = -8/30 = -4/15

2) -4/15 * (-5/8) = -1/3 * (-1/2) = 1/6

3) -5/12 - 0,75 = -5/12 - 75/100 = -5/12 - 3/4 = -5/12 - 9/12 = -14/12 = -7/6

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

5) 1/6 - (-1/2) = 1/6 + 1/2 = 1/6 + 3/6 = 4/6 = 2/3