Пошаговое объяснение:

№1

1) -11. 5/6 + 10. 7/18 = -11. 15/18 + 10. 7/18 = -1. 8/18 = -1. 4/9

2) -1. 4/9 - (-8. 46/63) = -1. 4/9 + 8. 46/63 = -1. 28/63 + 8. 46/63 = 7. 18/63 = 7. 2/7

3) 7. 2/7 - 5. 2/7 = 2

№2

Раскроем скобки:

-1,24 - 1. 7/15 + 2. 1/150 + 0,7 =

(-1,24 + 0,7) + (-1. 7/15 + 2. 1/150) =

-0,54 + (-1. 70/150 + 2. 1/150) =

-0,54 + (-1. 70/150 + 1. 151/150) =

-0,54 + 81/150 = -54/100 + 81/150 =

-162/300 + 162/300 = 0

№3

Раскроем скобки:

13/22 - 1. 31/55 + 2. 20/33 + 19/60 =

390/660 - 1. 372/660 + 2. 400/660 + 209/660 =

390/660 - 1032/660 + 2. 400/660 + 209/660 =

-642/660 + 2. 400/660 + 209/660 =

-642/660 + 1. 1060/660 + 209/660 =

1. 418/660 + 209/660 = 1. 627/660 = 1. (627:33)/(660:33) = 1. 19/20

№4

Раскроем скобки:

2,47 - 1. 64/75 - 1. 7/60 + 0,5 =

(2,47 + 0,5) + (-1. 64/75 - 1. 7/60) =

2,97 + (-1. 256/300 - 1. 35/300) =

2,97 + (-2. 291/300) = 2,97 + (-2,97) =

2,97 - 2,97 = 0