№ 1. Раскройте скобки и вычислите:
а) – (98 + 49) – (102 – 49)
б) (149 + 237) – (137 + 49)
№ 2. Раскройте скобки и упростите:
а)y – ( y – ( 2y – 4 ))
б) (2a + 5b) + (8a – 11b)
в) (3x + 10y) – (6x + 3y)
№ 3. Решите уравнение:
(7x + 1) – (6x + 3) = 5
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