Question

3x-y-(7x-2y+5,6)при x=-3,4; y=7

Answer 1

Легко и просто.Вроде правильно решил

Answer 2

To evaluate the expression $3x - y - (7x - 2y + 5.6)$ for the given values of $x$ and $y$, we substitute the values $x = -3$ and $y = 7$ as well as $x = 4$ and $y = 7$ into the expression.

1. When $x = -3$ and $y = 7$:

$3x - y - (7x - 2y + 5.6)$

Substitute $x = -3$ and $y = 7$:

$3(-3) - 7 - [7(-3) - 2(7) + 5.6]$

$=-9 - 7 - [-21 - 14 + 5.6]$

$=-9 - 7 + 21 + 14 - 5.6$

$=13.4$

2. When $x = 4$ and $y = 7$:

$3x - y - (7x - 2y + 5.6)$

Substitute $x = 4$ and $y = 7$:

$3(4) - 7 - [7(4) - 2(7) + 5.6]$

$=12 - 7 - [28 - 14 + 5.6]$

$=5 - 28 + 14 - 5.6$

$=-14.6$

So, when $x = -3$ and $y = 7$, the expression is $13.4$, and when $x = 4$ and $y = 7$, the expression is $-14.6$.