Question

2*(5х-4у)-3*(4-у). если х: -5 у: 0,8

Answer 1

-70.8

Пошаговое объяснение:

10х-8у-12-3у

10х-11у-12

10*(-5)-11*0.8-12

-50-8.8-12=-70.8

Answer 2

To evaluate the expression 2*(5x-4y)-3*(4-y) with the given values x = -5 and y = 0.8, we substitute these values into the expression and perform the calculations.

Substituting x = -5 and y = 0.8, we get:

2*(5*(-5) - 4*(0.8)) - 3*(4 - 0.8)

First, let's simplify the inner expressions:

2*(5*(-5) - 4*(0.8)) becomes 2*(-25 - 3.2) = 2*(-28.2) = -56.4

3*(4 - 0.8) becomes 3*(3.2) = 9.6

Now, we substitute these simplified expressions back into the main expression:

-56.4 - 9.6

Finally, we perform the subtraction:

-56.4 - 9.6 = -66

Therefore, when x = -5 and y = 0.8, the expression 2*(5x-4y)-3*(4-y) evaluates to -66.