662. Упростите выражение:
1) 5 - (a + 3); 2) 2 +(-8 + с);
8 - (10 + b); 3 + (-d - 5);
4 + (а - 9);
3) 0,8 (3)
1,4 + ( 2);
2,6 (k+ 10).​
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