878. Вычислить: 1) 17
5 9
+
16 16
-
7
2+
16
2)
11 8
9
НОМЕР 3-4
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1) 16.7 - (-8.9)= 16,7 + 8,9 = 24 + 1.6 = 25.6;
2) 7.2 - 8.9 = -1 - 0.7 = -1.7;
3) 0 - 5.7 = -5.7;
4) -13.6 - 14.4 = -14 - 14 = -28;
5) -14.8 - (-8.12) = -14.8 + 8.12 = -6.68;
6) 0 - (-19.3) = 0 + 19.3 = 19.3;
7) -7/24 - (-17/36) = -7/24 + 17/36 = -21/72 + 34/72 = 13/72;
8) 2/9 - 1/3 = 2/9 - 3/9 = -1/9;
9) 3 1/5 - (-4 1/7) = 3 + 4 + 1/5 + 1/7 = 7 + 7/35 + 5/35 = 7 + 12/35 7 12/35.