Question

По формулам сокращённого умножения

1.(2-4а)^2

2.(5+6у)^2

3.(8n-7m)^2

4. -11•(5y+3)^2

5.(5c+2a)(5c-2a)

6.(3x+x^3)^2

7. (3x-x)^3

Решите уравнение

36-(6-х)^2=x•(2,5-x)

Answer 1

1.(2-4а)^2=4-16а+16а^2
2.(5+6у)^2=25+60у+36у^2
3.(8n-7m)^2=64n^2-112nm+49m^2
4.-11*(5y+3)^2=-11*(25y^2+30y-9)=-275y^2-330y+99
5.(5c+2a)(5c-2a)=25c^2-4a^2
6.(3x+x^3)^2=8x^2+6x^4+x^6
7.(3x-x)^3=27x^3-18x^2+6x^3-x^3
Уравнение :
36-(6-x)^2=x*(2,5-x)
36-(36-12x+x^2)=2,5x-x^2
-12x-2,5x=-x^2+x^2
-14,5x=0
X=0