Вычисли устно. Запиши в тетради ответы.
1) 3х - 7х; 2) -2b + 2b; 3) -5y + 7y -2у; 4) 12х – 2х – 12х;
5) -3a - 6a; 6) 7m + (-7m); 7) -1,5n + 1,5n; 8) -7,3x + 7,3x + 3,7х
Дам 70
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