Вправи: 111

111. Виконайте дії:

1) a – 4a = 4\a1 – 4a = a2- 4a; 2) 1x + x – 2 = 1x + x\x1 – 2\x1 = 1+ x2- 2xx;

3) mn3 – 1n + m = mn3 – 1\n2n + m\n31 = m- n2+ n3mn3;

4) 2k2k-5 – k = 2k2\1k-5 – k\k-51 = 2b2- k(k-5)k-5 = 2k2- k2+ 5kk-5 = k2+ 5kk-5;

5) 3n – 9n2- 23n = 3n\3n1 – 9n2- 2\13n = 9n2- 9n2+ 23n = 23n;

6) 5 – 4y-12y-2 = 5\y-21 – 4y-12y-2 = 5y-2- (4y-12)y-2 = 5y-10-4y+12y-2 = y+2y-2.