Question

4) (3x+y)70. 1) 5(x-у); 2) 3(x+y); 3) (5х - у);при х= 2,5, y = 4,5. ​

Answer 1

Ответ:

1) -10

2)21

3)8

4)12

Пошаговое объяснение:

1)5(2,5-4,5)=12,5-22,5=-10

2)3(2,5+4,5)=7,5+13,5=21

3)(5х2,5-4,5)=8

4)(3х2,5+4,5)=12

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Answer 2

It looks like you want to evaluate the given expressions for specific values of $x$ and $y$. Let's substitute $x = 2.5$ and $y = 4.5$ into each expression and simplify:

1. $5(x - y)$: $5(2.5 - 4.5) = 5(-2) = -10$

2. $3(x + y)$: $3(2.5 + 4.5) = 3(7) = 21$

3. $5x - y$: $5(2.5) - 4.5 = 12.5 - 4.5 = 8$

4. $3x + y$ multiplied by 70: $70(3(2.5) + 4.5) = 70(7.5 + 4.5) = 70(12) = 840$

So, when $x = 2.5$ and $y = 4.5$, the values of the expressions are:

1. $5(x - y) = -10$
2. $3(x + y) = 21$
3. $5x - y = 8$
4. $3x + y$ multiplied by 70 = 840