Question

A. 3a-7b:a+bB. 2a+9b:2a+5b

Answer 1

Что нужно сделать? А то не понятно

Answer 2

A. To simplify the expression 3a - 7b : a + b, we can divide both terms by their greatest common factor (GCF). The GCF of 3a and a is simply a, while the GCF of -7b and b is b. Dividing both terms by their respective GCF, we get:

(3a / a) - (7b / b) : (a / a) + (b / b)

Simplifying further, we have:

3 - 7 : 1 + 1

3 - 7 : 2

-4 : 2

The simplified expression is -2.

B. Similarly, to simplify the expression 2a + 9b : 2a + 5b, we divide both terms by their GCF. The GCF of 2a and 2a is 2a, while the GCF of 9b and 5b is b. Dividing both terms by their respective GCF, we get:

(2a / 2a) + (9b / b) : (2a / 2a) + (5b / b)

Simplifying further, we have:

1 + 9 : 1 + 5

10 : 6

The simplified expression is 5/3 or approximately 1.67.