Question

1.Вычислите 1) (14\15 - 3\5)*15 2) 18*(8\9- 5\18)

Answer 1

1) (14\15 - 3\5)*15=(14/15-9/15)*15=5/15*15=5

2) 18*(8\9- 5\18)=18*(16/18-5/18)=18*11/18=11

Answer 2

1) (14/15-3/5) *15=1/3*15=5
2) 18*(8/9-5/18) =18*11/18=11

Answer 3

(14/15 - 3/5) * 15

To solve this expression, we need to find a common denominator for the two fractions inside the parentheses. The smallest number that both 15 and 5 can divide evenly is 15, so we'll convert 3/5 into an equivalent fraction with a denominator of 15:

(14/15 - (3/5) * (3/3)) * 15 = (14/15 - 9/15) * 15

Now we can subtract the two fractions:

(5/15) * 15 = 5

Therefore, the expression simplifies to:

(14/15 - 3/5) * 15 = 5 * 15 = 75

18 * (8/9 - 5/18)

Again, we need to find a common denominator for the two fractions inside the parentheses. The smallest number that both 9 and 18 can divide evenly is 18, so we'll convert 8/9 into an equivalent fraction with a denominator of 18:

18 * ((8/9) * (2/2) - 5/18) = 18 * (16/18 - 5/18)

Now we can subtract the two fractions:

18 * (11/18) = 11 * 2 = 22

Therefore, the expression simplifies to:

18 * (8/9 - 5/18) = 22