Question

19,7х-32,3у-3,5(3х-8у)+10х при х=-20, у=-5.

Answer 1

Ответ: -362,50.

Пошаговое объяснение:

при х = -20, у = -5

19,7х - 32,3у - 3,5(3х - 8у) + 10х = 19,7х - 32,3у - 3,5 *3х - 3,5 *(-8у) + 10х =

= 19,7х - 32,3у - 10,5х + 28у + 10х =  19,7х - 10,5х +10х -32,3у + 28у =

= 19,2х - 4,3у = 19,2 * (-20) - 4,3 *(-5) = - 384 +21,5  = -362,50  

Answer 2

To evaluate the expression 19(7x) - 32(3y) - 3.5(3x - 8y) + 10x when x = -20 and y = -5, we simply substitute these values into the expression and perform the calculations:

Let's start with the expression: 19(7x) - 32(3y) - 3.5(3x - 8y) + 10x

Substitute x = -20 and y = -5: 19(7(-20)) - 32(3(-5)) - 3.5(3(-20) - 8(-5)) + 10(-20)

Now, simplify each part of the expression step by step:

1. 19(7(-20)) = 19(-140) = -2660
2. -32(3(-5)) = -32(-15) = 480
3. 3(-20) = -60 and 8(-5) = -40, so 3(-20) - 8(-5) = -60 - (-40) = -60 + 40 = -20
4. -3.5(-20) = 70
5. -3.5(-20) - 3.5(8(-5)) = 70 - 3.5(-40) = 70 + 140 = 210
6. 10(-20) = -200

Now, put it all together: -2660 - 480 - 210 - 200 = -3550

So, when x = -20 and y = -5, the expression evaluates to -3550.