Ответ:
1. a + (3a - 4) = 4a - 4 ( Или 4(a - 1) )
2. 5(2+3x) = 10 + 15x
3. -(2x+5y)-(-3x+4y) = -2x - 5y + 3x - 4y = x - y
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Ответ:
1. a + (3a - 4) = 4a - 4 ( Или 4(a - 1) )
2. 5(2+3x) = 10 + 15x
3. -(2x+5y)-(-3x+4y) = -2x - 5y + 3x - 4y = x - y