Question

5x(2x-6y)-2.5x(4x-2y) если x=8 y=1/25

Answer 1

Ответ:

=-250

Пошаговое объяснение:

Answer 2

To evaluate the given expression $5x(2x-6y)-2.5x(4x-2y)$ for the values $x=8$ and $y=\frac{1}{25}$, you simply substitute the values of $x$ and $y$ into the expression and perform the calculations. Here's the step-by-step calculation:

Given expression: $5x(2x-6y)-2.5x(4x-2y)$ Substitute $x=8$ and $y=\frac{1}{25}$:

$5 \cdot 8(2 \cdot 8 - 6 \cdot \frac{1}{25}) - 2.5 \cdot 8(4 \cdot 8 - 2 \cdot \frac{1}{25})$

Now perform the calculations inside the parentheses:

$5 \cdot 8(16 - \frac{6}{25}) - 2.5 \cdot 8(32 - \frac{2}{25})$

$40(16 - \frac{6}{25}) - 20(32 - \frac{2}{25})$

$40 \cdot \frac{394}{25} - 20 \cdot \frac{798}{25}$

Now calculate the multiplications:

$40 \cdot \frac{394}{25} = \frac{15760}{25} = 630.4$

$20 \cdot \frac{798}{25} = \frac{15960}{25} = 638.4$

Finally, subtract the second result from the first result:

$630.4 - 638.4 = -8$

So, the value of the expression $5x(2x-6y)-2.5x(4x-2y)$ when $x=8$ and $y=\frac{1}{25}$ is $-8$.