§ 12: 12.9

12.9 Розкрийте дужки:

2a + a^0,5b^0,3 – 6a^0,5b^0,3 = 2a – 5a^0,5b^0,3;

a23+ 2a13b13+ b23;

(b^0,4)² + 6b^0,4 + 9 – 6b^0,4 = b^0,6 + 9;

(a13)³ + (a12)³ = a + a32;

((a16)² – (b16)²)(a13– b13) = (a13– b13)(a12– b13) = a23– 2a13b13+ b23;

(x39– 1)(x49+ x29+ 1)(x23 + 1) = (x23– 1)(x23+ 1) =x43– 1.