Раскройте скобки и упростите выражение:
1) (a + 4,6) − (a + 9,8);
2) −(8,8 − x) − (4,7 + x);
3) −(9,4 + x − y) + (4,1 − y);
4) (a − b + 6,1) − (−a − b + 6,1).
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