Question

1.3a*7b-3a+5ab+2a+a+3b^2-3ab-2ab 2.3a(4a+3b)-9b(a-b)

Answer 1

Ответ:

1. 3а*7b-3a+5ab+2a+a+3b2-3ab-2ab=21ab+3b^2
2. 3a(4a+3b)-9b(a-b)=12a^2+9ab-9ab-9b^2=12a^2-9b^2

Answer 2

Let's simplify the given expressions step by step:

1. 1.3a*7b - 3a + 5ab + 2a + a + 3b^2 - 3ab - 2ab

First, let's combine like terms:

(1.3a - 3a + 2a + a - 3ab + 5ab - 2ab) + (7b + 3b^2)

Now, simplify each group of like terms:

(1.3a - 3a + 2a + a - 3ab + 5ab - 2ab) = (1.3a - 3a + 2a + a - 3ab + 5ab - 2ab)

Now, combine like terms within parentheses:

(1.3a - 3a + 2a + a - 3ab + 5ab - 2ab) = (1.3a - 3a + 2a + a - 3ab + 5ab - 2ab) = (-1.7a + a^2 + 3b^2)

So, the simplified expression is:

-1.7a + a^2 + 3b^2

2. 3a(4a + 3b) - 9b(a - b)

Let's simplify this expression:

3a(4a + 3b) - 9b(a - b)

Now, distribute the terms inside the parentheses:

(3a * 4a + 3a * 3b) - (9b * a - 9b * b)

Now, perform the multiplications:

(12a^2 + 9ab) - (9ab - 9b^2)

Now, subtract the second expression within the parentheses from the first:

12a^2 + 9ab - 9ab + 9b^2

The '9ab' and '-9ab' cancel each other out:

12a^2 + 9b^2

So, the simplified expression is:

12a^2 + 9b^2