Раскройте скобки. 1) m (n + k) 2) 3(x + 1) + (x + 1) 3) 2a ( a + b) - b (2a - b) - b (b + 1) При а= -0,3 и b = -0,4.

1) m*(n + k) = mn + mk2) 3*(x + 1) + (x + 1) = 3x + 3 + x + 1 = 4x + 43) 2a*(a + b) - b*(2a - b) - b*(b + 1) = 2a^2 + 2ab - 2ab + b^2 - b^2 - b = 2a^2 - b;При а = - 0.3 и b = - 0.4 :2a^2 - b = 2 * (- 0.3)^2 - (-0.4) = 2 * 0.09 + 0.4 = 0.18 + 0.4 = 0.58