Question

Напишите вместо точек выражение,чтобы равенство было верным 1)а^2-6ab+...=(a-3b) 2)x^2+25y^2=(x-5y)^2-... 3)4x^2+49y^2=(2x-7y)^2+... 4)36a^2+84ab+..=(6a+7b)^2 ПОМОГИТЕ СРОЧНО ДАЮ 20 БАЛЛОВ!!!!!!!!!!!!

Answer 1

Ответ:

на фотооооооо

Пошаговое объяснение:

смотри на фото. формулы сокращённого умножения квадрат суммы, квадрат разности.

Answer 2

1) To complete the expression and make the equation true, we need to find the missing term. Let's expand the expression (a-3b)^2:

(a-3b)^2 = a^2 - 6ab + 9b^2

Comparing this with the given expression a^2 - 6ab + ..., we can see that the missing term is 9b^2. Therefore, the complete expression is:

a^2 - 6ab + 9b^2 = (a-3b)^2

2) Let's expand the expression (x-5y)^2:

(x-5y)^2 = x^2 - 10xy + 25y^2

Comparing this with the given expression x^2 + 25y^2 = ..., we can see that the missing term is -10xy. Therefore, the complete expression is:

x^2 + 25y^2 = (x-5y)^2 - 10xy

3) Let's expand the expression (2x-7y)^2:

(2x-7y)^2 = 4x^2 - 28xy + 49y^2

Comparing this with the given expression 4x^2 + 49y^2 = ..., we can see that the missing term is -28xy. Therefore, the complete expression is:

4x^2 + 49y^2 = (2x-7y)^2 - 28xy

4) Let's expand the expression (6a+7b)^2:

(6a+7b)^2 = 36a^2 + 84ab + 49b^2

Comparing this with the given expression 36a^2 + 84ab + ... = ..., we can see that the missing term is 49b^2. Therefore, the complete expression is:

36a^2 + 84ab + 49b^2 = (6a+7b)^2

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