Відповіді до вправ § 1 - § 12: 4.23

4.23 Виконайте дію:

1) m-13(m+2) + mm+2 = m-1+3m3(m+2) = 4m-13(m+2);

2) 7a3(b+2a) – 4a9(b+2a) = 21a-4a9(b+2a) = 17a9(b+2a);

3) x-23x-12 – x+12x-8 = x-23(x-4) – x+12(x-4) = 2x-4-3x-36(x-4) = -x-76(x-4) = –x+76(x-4) = x+724-6x;

4) 3mx+my + 2nx+ny = 3m(x+y) + 2n(x+y) = 3n+2mmn(x+y);

5) 4a – 8a(a+2) = 4a+2- 8a(a+2) = 4a+8-8a(a+2) = 4aa(a+2) = 4a+2;

6) 8m2+ 8m – 1m = 8m(m+8) – 1m = 8-(m+8)m(m+8) = 8-m-8m(m+8) = -mmm+8 = –1m+8.