842. Найдите сумму одинаковых слагаемых:

1) -3+(-3) + (-3) + (-3) + (-3) + (-3) + (-3) + (-3) + (-3) + (-3);

2) —7 + (-7) + (-7) + (-7) + (-7) + (-7) + (-7) + (-7) + (-7);

3) -50 + (-50) + ... + (-50) + (-50).
20 слагаемых​
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