Question

решите все очень надо с решением​

Answer 1

1.

$15 {a}^{2} {b}^{3} ( - 2ab {}^{2} {)}^{5} = - {2}^{5} \times 15 {a}^{7} {b}^{13} = - 480{a}^{7} {b}^{13}$

2.

${x}^{2} {y}^{2} - 9 {y}^{2} = (xy) {}^{2} - (3y) {}^{2} = (xy - 3y)(xy + 3y)$

3.

$\frac{2x - 3}{3} + \frac{5x - 3}{6} = 3 \\ \frac{6(2 x - 3)}{3} + \frac{6(5x - 3)}{6} = 3 \times 6 \\ 2(2x - 3) + 5x - 3 = 18 \\ 4x - 6 + 5x - 3 = 18 \\ 9x - 9 = 18 \\ 9(x - 1) = 18 \\ x - 1 = 2 \\ x = 3$

ответ:3.

4.{6х-16у=40,

{2х+4у=4;

{3×2х-16у=40,

{2х=4-4у;

{3(4-4у)-16у=40,

{2х=4-4у;

{12-12у-16у=40,

{2х=4-4у;

{12-28у=40,

{2х=4-4у;

{-28у=40-12,

{2х=4-4у;

{у=-1,

{2х=4+4,

{у=-1,

{х=4.

ответ: (4;-1).

5. у=kx+b

A(1;7)

B(-1;3)

{7=1k+b,

{3=-1k+b;

{10=2b,

{7=k+b;

{b=5,

{k=7-b;

{b=5,

{k=2.

y=2x+5

ответ: у=2х+5