Помогите плиииз!!срочно!!!

Ответ:

1.

a) а*(30а+11b)

b) m^2*(17m^3–5m)

в) 6x^2y*(2y^3–3xy^2+1)

2.

a) (a–c)*(4c+7c)=10c*(a–c)

b) z*(x+y)+5*(x+y)=(x+y)*(z+5)

3.

a) 5*(a^2–b^4)= 5*(a–b^2)*(a+b^2)

b) –4*(m^2–6mn+9n^2)=–4*(m–3n)^2

4.

x^2–14x+49+3=x^2–4

–14x=–56

x=4

5.

1.6*(6.4^2–3.6^2). 1.6*(6.4–3.6)*(6.4+3.6). 1.6*2.8*10

______________=. ----------------------------------. = ---------------

0.4*(2.4^2–0.4^2). 0.4*(2.4–0.4)*(2.4+0.4). 0.4*2*2.8

16

=. ----- =20

0.8