Question

Номер 831 помогите сделать плиииз

Answer 1

Пошаговое объяснение:

1. (0.9 × 5 + 5 × 0.6) - (0.7 × 2 +3 × 0.7) = (4.5 + 3.0) + (1.4 + 2.1) = 7.5 + 3.5 = 11.0

2. (13 × 2.5 - 2.5 × 9) +(8 × 5.6 - 3.1 × 8) = (32.5 - 22.5) + (44.8 - 24.8) = 10 + 20 = 30

3. (3.61 × 7 + 7 × 0.13) - (2.26 × 4 + 3 × 2.26) = (25.27 + 0.91) - (9.04 + 6.78) = 26.18 - 15.82 = 10.36