Вправи: 97

97. Виконайте дію:

1) 1a2 + a-2a = 1 + a2- 2aa2;

2) 2+mm2 – m2- 5m3 = 2m+ m2- m2+ 5m3 = 2m+5m3;

3) 12x5 + 1-3x2x7 = x2+ 2-6x22x7 = 2-5x22x7;

4) a-bab – b-ab2 = ba-b- a(b-a)ab2 = ab- b2- ab+ a2ab2 = a2- b2ab2;

5) 3n+mmn2 + n-3mm2n = m3n+m+ n(n-3m)m2n2 = 3mn+ m2+ n2- 3mnm2n2 = m2+ n2m2n2;

6) x-2yxy2 – y-2xx2y = xx-2y- y(y-2x)x2y2 = x2- 2xy- y2+ 2xyx2y2 = x2- y2x2y2.