Verified answer

Пошаговое объяснение:

№1

1) -5/7 * (-1,4) = -5/7 * (-14/10) = -1/1 * (-2/2) = 2/2 = 1

2) 1 * 3 1/2 = 3 1/2

3) 3 1/2 * 2/7 = 7/2 * 2/7 = 1/1 * 1/1 = 1/1 = 1

№2

1) -3/11 * (-2/15) = -1/11 * (-2/5) = 2/55

2) 2/55 * 7 1/3 = 2/55 * 22/3 = 2/5 * 2/3 = 4/15

3) 4/15 * (-6) = -24/15 = -8/5

4) -8/5 * 40 = -8/1 * 8 = -64/1 = -64

№3

1) -5 * (-4) = 20

2) 20 * (-3) = -60

3) -60 * (-1) = 60

4) 1/3 * 1/4 * 1/5 = 1/(3*4*5) = 1/60

5) 60 * 1/60 = 60/60 = 1