Question

решите пж дам 20 балов

Answer 1

1. а)

$5 {x}^{3} \times 9 {x}^{6} = 45 {x}^{9}$

б)

$9 {x}^{2} - 1 + 9 {x}^{2} + 6x + 1 = 18 {x}^{2} + 6x = 6x(3x + 1)$

2. а)

$a(25 - {b}^{2} ) = a(5 - b)(5 + b)$

б)

$3( {a}^{2} - 2a + 1) = 3{(a - 1)}^{2}$

3.

$x - 4 + 6x = 10 \\ 7x = 14 \\ x = 2$

4.

$\binom{2x + 2y = 12}{5x - 2y = 9} \\ 7x = 21 \\ x = 3 \\ 3 + y = 6 \\ y = 3$

5.

$y = 2x - 3$

x=0, y=-3

x=1, y=-1

x=1/2, y=0.