Раскройте скобки, найдите значение выражения:

1) 2 + (7 - 15);

2) (-16 +9) + (13 -8);

3) 7 - (8 - 2);

4) -(-9 + 1) + (13 - 6);

5) (17 - 20) - (15 - 21);

6) -0,56 + (3,8 - 2,44);

7) -3,24 - (-4,76 - 2,9);

8) -5,7 + (2 5/6 - 8,3);

9) 2 7/15 - (2 2/15 - 8 1/9);

10) (х - 7,2) - (4,2 + х).

/ - дробь.
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