Question

Б) 10а - а -8b + 7b = в) х + у – х - 5у + 4 = г) -15с - 15а + 8а + 4с =

Answer 1

Ответ:б) 9а-b

в) -4y+4

г) -11с-7а

Answer 2

Let's simplify each expression step by step:

а) 10а - а - 8b + 7b

Combine the like terms (terms with the same variables raised to the same powers): = 10а - а + 7b - 8b

Combine the 'a' terms: = (10 - 1)а + (7 - 8)b

Simplify: = 9а - b

б) х + у - х - 5у + 4

Combine the like terms (terms with the same variables raised to the same powers): = х - х + у - 5у + 4

The 'х' terms cancel out: = 0 + у - 5у + 4

Combine the 'у' terms: = -4у + 4

в) -15с - 15а + 8а + 4с

Combine the like terms (terms with the same variables raised to the same powers): = -15с + 8а + 4с - 15а

Combine the 'c' terms and 'а' terms separately: = (-15 + 4)с + (8 - 15)а

Simplify: = -11с - 7а

So, the simplified expressions are: а) 9а - b б) -4у + 4 в) -11с - 7а