Вправи: 424

424. Спростіть вираз:

1) 3m-712m + 13-5m12m – 6m-212m = 3m-7+13-5m-6m+212m = 8-8m12m = 8(1- m)12m = 2(1- m)3m;

2) m2+ 1a(m-1) – 2a(m-1) = m2+ 1-2a(m-1) = m2- 1a(m-1) = (m-1)(m+1)a(m-1) = m+1a;

3) x-8x2- 25 + 13x2- 25 = x-8+13x2- 25 = x+5x2- 25 = x+5(x-5)(x+5) = 1x-5;

4) a-4a-2 – 22- a = a-4a-2 + 2a-2 = a-4+2a-2 = a-2a-2 = 1.