Question

4 x 0,3 X -2 У+ 7,8 х - у если х-у =0,5

Answer 1

10x-3y=(10-3)(x-y)=7×0.5=3,5

(Поставьте спасибо за правильный ответ)

Answer 2

To solve the expression, substitute the value of (x - y) = 0.5 into the given expression:

4 * 0.3 * (x - 2 * y) + 7.8 * x - y

Now, replace (x - y) with 0.5:

4 * 0.3 * (0.5) + 7.8 * x - y

Calculate the first part:

4 * 0.3 * 0.5 = 0.6

Now, the expression becomes:

0.6 + 7.8 * x - y

Since (x - y) = 0.5, you can also write it as:

0.6 + 7.8 * x - 0.5

Now, to simplify further, combine the constants:

0.6 - 0.5 = 0.1

The expression now becomes:

0.1 + 7.8 * x

And that's the simplified expression. If you have a specific value for x, you can plug it in to find the result. For example, if x = 2:

0.1 + 7.8 * 2 = 0.1 + 15.6 = 15.7

So, when x - y = 0.5 and x = 2, the expression evaluates to 15.7.