Verified answer

Ответ:

1) х=18⅕+2 7/15

х=18 3/15 + 2 7/15

х= 20 10/15

х= 20 ⅔

2) -х=7⅗-10 ⅝

-х=7 24/40 - 10 25/40

-х = -3 1/40

х=3 1/40

3) х=2⅞-3⅚+4⅔

х=2 21/24 - 3 20/24 + 4 16/24

х=3 17/24