Question

1. )2(2b-6)-7b(8-b)+(3b-4)(-3) 2. 1,2(0,5b-6a)-4(b+7a)-6(b-a)

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

Let's simplify each expression step by step:

1. )2(2b-6)-7b(8-b)+(3b-4)(-3)

Step 1: Distribute the values inside parentheses: 2 * 2b - 2 * 6 - 7b * 8 + 7b * b + 3b * -3 - 4 * -3

Step 2: Simplify each term: 4b - 12 - 56b + 7b^2 - 9b - (-12)

Step 3: Combine like terms: (-56b + 4b - 9b) + (7b^2) + (-12 + 12) = -61b + 7b^2

The simplified expression is: 7b^2 - 61b

2. 1,2(0,5b-6a)-4(b+7a)-6(b-a)

Step 1: Distribute the values inside parentheses: 1.2 * 0.5b - 1.2 * 6a - 4b - 4 * 7a - 6b + 6a

Step 2: Simplify each term: 0.6b - 7.2a - 4b - 28a - 6b + 6a

Step 3: Combine like terms: (0.6b - 4b - 6b) + (-7.2a - 28a + 6a)

Step 4: Further simplify: (-9.4b) + (-29.2a)

The simplified expression is: -9.4b - 29.2a