Question

1)-2,4y×(-6); 2) 5m-3n-7m + 4n; 3) k + (k - 7) - (k - 8); 4)9×(d+4)-8×(d - 3).

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

Let's solve each expression step by step:

1. -2 * 4y * (-6) Applying the rules of multiplication, we can simplify this expression as follows: -2 * 4y * (-6) = -8y * (-6) Multiplying -8y by -6 gives us a positive result: -8y * (-6) = 48y

   Therefore, the simplified expression is 48y.

2. 5m - 3n - 7m + 4n We can simplify this expression by combining like terms: 5m - 7m + 3n + 4n = (5m - 7m) + (3n + 4n) Combining the terms with 'm' and 'n' separately: -2m + 7n

   Thus, the simplified expression is -2m + 7n.

3. k + (k - 7) - (k - 8) We need to simplify the expression within the parentheses first: (k - 7) - (k - 8) = k - 7 - k + 8 Notice that the 'k' terms will cancel each other out: (k - k) - 7 + 8 = 0 - 7 + 8 = -7 + 8 = 1

   Hence, the simplified expression is 1.

4. 9 * (d + 4) - 8 * (d - 3) We will simplify the expression within each set of parentheses first: 9 * (d + 4) - 8 * (d - 3) = 9 * d + 9 * 4 - 8 * d + 8 * 3 Multiplying within each set of parentheses: 9d + 36 - 8d + 24 Combining the 'd' terms and the constant terms: (9d - 8d) + (36 + 24) = d + 60

   Thus, the simplified expression is d + 60.