Ответ:

1)m²-n²

2)c²-6c+9

3) a³-125

4)4.225-1.225=3.000

5)(5x-0,6y²)(5x+0,6y²)

6)x1= -7. x2= 7

7)10-2x

8)5(x-2)(x+2)

9)не нашла(

Verified answer

Ответ:

Объяснение:

1. (m-n)*(m+2)= [tex]m^{2} -n^{2}[/tex]
2.
[tex](3-c[/tex][tex])^{2}[/tex]= [tex]9-c+c^{2}[/tex] = [tex]c^{2}-6c+9[/tex]
3. (a-5)*(a²+5a+25) = [tex]a^{3} - 5^{3} = a^{3}-125[/tex]
4. 65²-35²= (65-35)*(65+35)= 30*100 = 3000
5. 25x²-0.36y⁴ = [tex]25x^2 - \frac{9}{25} y^4[/tex]= [tex](5x -\frac{3}{5}y^2) * (5x + \frac{3}{5}y^2)[/tex]
6.x²-49=0
[tex]x^{2}[/tex]=49
x=7
x=-7
7. (3-x)(3+x)+(1-x)²= [tex]9-x^2+1-2x+x^2[/tex] = 10-2x
8. 5x²-20 = [tex]5(x^2-4) = 5(x-2) * (x+2)[/tex]
9. 5x²-5y²-20x³y+20xy³ = 5(x²-y²-4x³y+4xy³) = (x²-y²-4xy*(x²-y²)) = 5(x²-y²)*(1-4xy)