1. Раскройте скобки:
1) (a – b) + (c – d)
2)- (-a + b) – (- c – d)
3) (a + b) – (c + d)
4) –(a + b) + (- c – d)
5) – (a – b) – (c + d)
6) (a – b) - (c – d)
7)- (-a - b) + (- c – d)
8) (a + b) + (- c + d)
9) –(a - b) + (-c – d)
10) – (a + b) – (c + d)


3. Решите уравнение:
а) 84 – (x – 36) = 18
б) 96 – (26 – y) = 4