Question

помогите пж даю 50балов​

Answer 1

2) 3.6х - 8.2у, при х = 0.5, у = -1.5

(3.6 * 0.5) - (8.2 * (-1.5)) = 1.8 - (-12.3) = 14.1

3) 12.5а² + 3.6b, при а = 1.2, b = 0.8

а² = 1.2² = 1.44

(12.5 * 1.44) + (3.6 * 0.8) = 18 + 2.88 = 20.88

4) 15х² - 4.2у², при х = 0.8, у = 6/5.

х² = 0.8² = 0.64

у² = (6/5)² = 1.44

(15 * 0.64) - (4.2 * 1.44) = 9.6 - (~6) = 3.6 = 36/10.