Question

Найдите значение выражения (3-х)(2+х)+(5-х)(6-х) при х=3/20

Answer 1

(3 - 3/20)(2 + 3/20) + (5 - 3/20)(6 - 3/20) = (2 20/20 - 3/20)(1 20/20 + 3/20) + (4 20/20 - 3/20)(5 20/20 - 3/20) = 2 17/20 × 2 3/20 + 4 17/20 × 5 17/20 = 57/20 × 43/20 + 97/20 × 117/20 = 2451/400 + 11329/400 = (2451 + 11329)/400 = 13780/400 = 34 180/400 = 34.45