Вправи: 38

38. Зведіть дріб:

1) a\4a+2 = 4a4a+8 = 4a4(a+2);

2) m\m+2nm-3n = m(m+3n)m2- 9n2 = m2+ 3mnm-3n(m+3n);

3) x-72x-y = -7x7y-14x = -7x-7(2x-y);

4) 5b2a+3b = 5b(2a+3b)4a2+ 12b+9b2 = 10ab+15b2(2a+3b)2;

5) x+1x2+ x+1 = x+1(x-1)x3- 1 = x2- 1x-1(x2+ x+1).