Question

1) 7а – 8а; 2) 2т + 3т – 9т.

Answer 1

Ответ ниже:

1) -a

2) -4t

Answer 2

It seems like you've provided two algebraic expressions, and it looks like you want to simplify them. Let's simplify each expression:

1. 7a - 8a: To simplify this expression, you can combine like terms. In this case, you have two terms with the variable 'a.'

7a - 8a = (7 - 8)a

Now, subtract 8 from 7:

(7 - 8) = -1

So, the simplified expression is:

-1a or simply -a

2. 2t + 3t - 9t: Again, we will combine like terms by adding or subtracting them:

2t + 3t - 9t = (2 + 3 - 9)t

Now, perform the addition and subtraction within the parentheses:

(2 + 3 - 9) = (5 - 9) = -4

So, the simplified expression is:

-4t

Now you have the simplified forms of both expressions:

1. 7a - 8a = -a
2. 2t + 3t - 9t = -4t