1вычисли, используя правило умножения суммы на число. (6+8)*7= (5+7)*4= (3+9)*8= (4+8)*5= (9+5)*3= (8+7)*6= 2 вычисли удобным

1) (6+8)*7 = (14)*7 = 98
Explanation: According to the rule of multiplying a sum by a number, we first add the two numbers inside the parentheses (6 + 8 = 14) and then multiply the result by the number outside the parentheses (14 * 7 = 98).

2) (5+7)*4 = (12)*4 = 48
Explanation: Following the same rule, we add the numbers inside the parentheses (5 + 7 = 12) and then multiply the result by the number outside the parentheses (12 * 4 = 48).

3) (3+9)*8 = (12)*8 = 96
Explanation: Again, we add the numbers inside the parentheses (3 + 9 = 12) and then multiply the result by the number outside the parentheses (12 * 8 = 96).

4) (4+8)*5 = (12)*5 = 60
Explanation: Applying the rule, we add the numbers inside the parentheses (4 + 8 = 12) and then multiply the result by the number outside the parentheses (12 * 5 = 60).

5) (9+5)*3 = (14)*3 = 42
Explanation: Once again, we add the numbers inside the parentheses (9 + 5 = 14) and then multiply the result by the number outside the parentheses (14 * 3 = 42).

6) (8+7)*6 = (15)*6 = 90
Explanation: Using the rule, we add the numbers inside the parentheses (8 + 7 = 15) and then multiply the result by the number outside the parentheses (15 * 6 = 90).

2) For the second question, you need to calculate the given expression using a method that you find convenient.

Since there is no specific expression mentioned in the question, you can choose any expression to evaluate and provide the steps and explanation accordingly.