Раскройте скобки и найдите значение выражения:

1) (4,71 − 8,9) + (8,9 − 4,71); 3) (5,9 + 3,1) − (5,9 − 3,1);

2) 61138(4−,2 −2)178(1,−2 ;) 4) 8−1131−23(11−31) .

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