№972.Вычислите:
1) (15-30)-(10-20);
2) (40-70)-(15-45);
3) (1-19)-(31-41);
4) (-45+10)-(-8-0).
№974.Замените вычитание сложением и вычислите:
1) -17-43; 2) -69-41; 3) -150-50; 4) -160-40.
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