А-7. Домашнее задание по теме «Приведение подобных слагаемых»



Вариант 18



1) 2y - 6a – 12y +12a;

2) - (2 – a) – a + (2a + 1);

3) - 21(– y – 2k) + 2(– y + 3k);

4) 4x – (3 – 3(2x + 5)).

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