немецкий
1
английский
2
французский
3
4
5
6
7
Задача
1+4+7+5=30
2+4+7+6=28
3+5+6+7=42
4+7=8
6+7=10
5+7=5
7=3
5=5-3=2
6=10-3=7
4=8-3=5
1=30-10=20
2=28-15=13
3=42-12=30
100-30-20-13-3-2-7-5=20
Ответ: 20
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