Вправи: 636

636. Спростіть вираз:

1) 2yy+ y = 2yy(y+ 1) = 2y+ 1;

2) c3c- c = cc(3c- 1) = 13c- 1;

3) 12m- 12n3m- 3n = 12(m-n)3(m-n) = 4 = 2;

4) mn+ m1+ n = m(n+ 1)1+ n = m;

5) mp+ 2pma+ 2a = p(m+ 2)a(m+ 2) = pa;

6) y-25y+ 5 = y- 5(y+ 5)y+ 5 = y – 5;

7) n2- 7n- 7 = n- 7(n+ 7)n- 17 = n + 7;

8) x-19x+ 19 = x- 19(x+ 19)x+ 19 = x – 19.