662. Упростите выражение:

1)

5 - (a + 3);
8 - (10 + b);
9 - (с+ 7);


2)

2 + (-8 + с);
3+(-d – 5);
4 + (а – 9);


3)

0,8 - (m+ 3);
1,4 + (n - 2);
2,6 - (-k+ 10).
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