2) Раскройте скобки и приведите подобные слагаемые 1. 3b + (5a - 7b) 2. -3x - (8y - 3x) 3. -(11a + b) - (12a - 3b) 4. 3(8a - 4) + 6a 5. 7p - 2(3p - 1) 6. -4(3a + 2) + 8

Решение:

• 1. 3b + (5a - 7b) = 3b + 5a - 7b = 5a + (3 - 7)b = 5a - 4b
• 2. -3x - (8y - 3x) = -3x - 8y + 3x = (-3 + 3)x - 8y = -8y
• 3. -(11a + b) - (12a - 3b) = -11a - b - 12a + 3b = (-11 - 12)a + (-1 + 3)b = -23a + 2b
• 4. 3(8a - 4) + 6a = 24a - 12 + 6a = (24 + 6)a - 12 = 30a - 12
• 5. 7p - 2(3p - 1) = 7p - 6p + 2 = (7 - 6)p + 2 = p + 2
• 6. -4(3a + 2) + 8 = -12a - 8 + 8 = -12a + (-8 + 8) = -12a