Ответы на вопрос:
1) |a| + |b| = |-3| + |-7| = 3 + 7 = 10; |a+b| = |-3 + (-7)| = |-10| = 10; 2) |a| + |b| = |-4| + |-10| = 4 + 10 = 14; |a +b| = |-4 + (-10)| = |-14| = 14; 3) |a| + |b| = |7,2| + |2,8| = 7,2 + 2,8 = 10; |a + b| = |7,2 + 2,8| = |10| = 10.
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