Question

1)-3,5а+2,8а+6,5а 2)2/3х+3/7х-5/21х 3)2,9у-4,2у+6,2у-4,2у​

Answer 1

1) 5,8а

2) 15/21х

3) 7у

Answer 2

It looks like you have some algebraic expressions that involve variables. Let's simplify each of them:

1. -3a + 5.8a + 6.5a

To simplify this expression, you can combine like terms by adding or subtracting the coefficients of the 'a' variable:

-3a + 5.8a + 6.5a = (-3 + 5.8 + 6.5)a = 9.3a

So, the simplified expression is 9.3a.

2. (2/3)x + (3/7)x - (5/21)x

To simplify this expression, you can find a common denominator for the fractions and then combine like terms:

Common denominator for 2/3, 3/7, and 5/21 is 21.

(2/3)x + (3/7)x - (5/21)x = (14/21)x + (9/21)x - (5/21)x

Now, combine the fractions with the same denominator:

(14/21 + 9/21 - 5/21)x = (18/21)x

Now, simplify the fraction:

(18/21)x = (6/7)x

So, the simplified expression is (6/7)x.

3. 2.9y - 4.2y + 6.2y - 4.2y

To simplify this expression, you can combine like terms by adding or subtracting the coefficients of the 'y' variable:

2.9y - 4.2y + 6.2y - 4.2y = (2.9 - 4.2 + 6.2 - 4.2)y = 0.7y

So, the simplified expression is 0.7y.