Question

Розкрийте дужки і зведіть подібні доданки: а) 9(7x-6)-18x; b)-(-4,9-5,8z)-(3,1z-5,6). 2,8(5b-6a)-7b-8a)*1,2 Дам всі бали Срочно❗️❗️

Answer 1

Ответ:

а)63х-54-18х=45х-54

Пошаговое объяснение:

9 умеажается на 7х и -6 а потом прибавление(отнимание

Answer 2

a) To simplify the expression 9(7x-6)-18x, we can distribute the 9 to both terms inside the parentheses and then combine like terms. Let's break it down step by step:

Step 1: Distribute the 9 to both terms inside the parentheses: 9 * 7x = 63x 9 * -6 = -54

So, the expression becomes: 63x - 54 - 18x

Step 2: Combine like terms: 63x - 18x = 45x

Finally, the simplified expression is: 45x - 54.

b) To simplify the expression -(-4.9-5.8z)-(3.1z-5.6), we can start by removing the double negative sign and then combine like terms. Let's break it down step by step:

Step 1: Remove the double negative sign: -(-4.9-5.8z) becomes 4.9 + 5.8z

So, the expression becomes: 4.9 + 5.8z - (3.1z - 5.6)

Step 2: Distribute the negative sign to both terms inside the parentheses: -(3.1z - 5.6) becomes -3.1z + 5.6

So, the expression becomes: 4.9 + 5.8z - 3.1z + 5.6

Step 3: Combine like terms: 5.8z - 3.1z = 2.7z

Finally, the simplified expression is: 4.9 + 2.7z + 5.6.

c) To simplify the expression 2.8(5b-6a)-7b-8a*1.2, we can distribute the coefficients and then combine like terms. Let's break it down step by step:

Step 1: Distribute the coefficient 2.8 to both terms inside the parentheses: 2.8 * 5b = 14b 2.8 * -6a = -16.8a

So, the expression becomes: 14b - 16.8a - 7b - 8a * 1.2

Step 2: Distribute the coefficient -8 to the term 8a: -8 * 1.2 = -9.6

So, the expression becomes: 14b - 16.8a - 7b - 9.6 - 8a

Step 3: Combine like terms: 14b - 7b = 7b -16.8a - 8a = -24.8a

Finally, the simplified expression is: 7b - 24.8a - 9.6.

I hope this helps! Let me know if you have any further questions.