Question

7,3a-4-2,9a-7 8,2x+1,2-3,7x-2,7 -7,9a-3,7-8,2+5 Упростите.

Answer 1

7,3a-4-2,9a-7=4,4a-11; 8,2x+1,2-3,7x-2,7=4,5x-1,5; -7,9a-3,7-8,2+5a= -2,9a-11,9.

Answer 2

7,3a-4-2,9a-7  = (7,3a-2,9a) -(4+7) = 4,4а-11

8,2x+1,2-3,7x-2,7  = (8,2x-3,7x)+(1,2-2,7)  = 4,5х+(-1,5) = 4,5х-1,5

-7,9a-3,7-8,2+5 = -7,9a-(3,7+8,2-5) = -7,9а-(6,9) = -7,9а-6,9

Answer 3

To simplify the given expression, let's combine like terms:

Expression: 7 + 3a - 4 - 2.9a - 7 + 8.2x + 1.2 - 3.7x - 2.7 - 7.9a - 3.7 - 8.2 + 5

First, let's combine the constant terms: (7 - 4 - 7 + 1.2 - 2.7 - 3.7 - 8.2 + 5) = (-12.4)

Next, let's combine the terms with 'a': (3a - 2.9a - 7.9a) = (3a - 2.9a - 7.9a) = -7.8a

And now, let's combine the terms with 'x': (8.2x - 3.7x) = (8.2x - 3.7x) = 4.5x

Finally, we put it all together: -12.4 - 7.8a + 4.5x

So, the simplified expression is: -12.4 - 7.8a + 4.5x