Вправи: 160

160. Виконайте дії:

1) y-25 + 3+y5 + 1-y5 = y-2+3+y+1-y5 = y+25;

2) a3a-c – c3a-c = a3- c3a-c = a-c(a2+ ac+ c2)a-c = a² + ac + c²;

3) 64a-4 – a3a-4 = 64-a3a-4 = 43- a3a-4 = –4-a(16+4a+ a2)a-4 = –a² – 4a – 16;

4) xx3+ y3 – yx3+ y3 = x+yx3+ y3 = x+yx+y(x2- xy + y2) = 1x2- xy + y2;

5) x2+ y2x3+ y3 – xyx3+ y3 = x2+ y2- xyx3 + y3 = x2+ y2- xyx+y(x2- xy + y2) = 1x+y;

6) y2x3- y3 + xy+ x2x3- y3 = y2+ xy+ x2x-y(x2+ xy + y2) = 1x-y.