Question

2) - 2 2/5 * x * 3/7 * y якщо x = - 7 ; y = 1 1/4

Answer 1

$- 2 \frac{2}{5} x \times \frac{3}{7} y = - \frac{12 \times 3}{5 \times 7} xy = - \frac{36}{35} xy = - \frac{36}{35} \times ( - 7) \times 1 \frac{1}{4} = \frac{36 \times 7 \times 5}{35 \times 4} = 9$

Answer 2

To evaluate the expression, substitute the given values of x and y into the expression:

x = -7 y = 1 1/4 = 5/4

Now let's calculate the expression:

2 - 2 2/5 * x * 3/7 * y

Substituting the values of x and y:

2 - 2 2/5 * (-7) * 3/7 * (5/4)

Simplifying the expression step by step:

2 - 12/5 * (-7) * 3/7 * 5/4

Multiplying the fractions:

2 - (12 * (-7) * 3 * 5) / (5 * 7 * 4)

2 - (-2520) / (140)

2 + 18

The result is 20.