Question

-3a+7b-7a+2b при а= -0.8 и b=5/9

Answer 1

Ответ:

$2.4 + \frac{35}{9} + 5.6 + \frac{10}{9} = \frac{12}{5} + \frac{35}{9} + \frac{28}{5} + \frac{10}{9} = 13$

Answer 2

To evaluate the expression -3a + 7b - 7a + 2b with a = -0.8 and b = 5/9, we substitute these values into the expression and perform the calculations.

Let's substitute the values:

-3a + 7b - 7a + 2b

= -3(-0.8) + 7(5/9) - 7(-0.8) + 2(5/9)

= 2.4 + (35/9) + 5.6 + (10/9)

Now, let's simplify the expression:

= 2.4 + 5.6 + (35/9) + (10/9)

= 8 + (35/9) + (10/9)

To add the fractions, we need a common denominator:

= 8 + (35/9) + (10/9)

= 8 + 45/9

Now, let's convert the whole number 8 to a fraction with a denominator of 9:

= (72/9) + (45/9)

= 117/9

We can simplify the fraction:

= 13

Therefore, when a = -0.8 and b = 5/9, the expression -3a + 7b - 7a + 2b evaluates to 13.