а)Выпиши в один столбик суммы, а в другой расности.Найди их значения.

20+6
69-9
93-3
30+7
40+8
87-7
74-4
50+9
30+0
30-0
100-60
60+40

б)20+30+10
60-40+80
50+10+40
20-10+80
30+60-90
70-20+40
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