1)4a-4a^3+a^2=4a(1-a^2+a)
2)3r^3+3r^2-3r=3r(r^2+r-1)
Решение прикреплено ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔<span> ✔</span>
Ответ вот это: 12х2у-16хух.
<span>1.
{2x-3y=5
{x-6y=-2 => x=-2+6y
2(-2+6y)-3y=5
-4+12y-3y=5
9y=9
y=1
x=4
2.
{</span><span>2x-3y=11
{5x+y=2 => y=2-5x
</span><span>2x-3(2-5x)=11
2x-6+15x=11
17x=17
x=1
y=-3
3.
{</span>x²<span>-3y=22
{x+y=2 => x=2-y
</span>(2-y)²-3y=22
4-4y+y²-3y-22=0
y²-7y-18=0
y₁+y₂=7
y₁*y₂=-18
y₁=9; x₁=-7
y₂=-2; x₂=4
4.
{<span>x+y=4 => y=4-x
{x</span>²<span>-4y=5
x</span>²-4(4-x)=5
x²-16+4x-5=0
x²+4x-21=0
x₁+x₂=-4
x₁*x₂=-21
x₁=-7; y₁=11
x₂=3; y₂=1
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( b - 2)( b² + 2b - 3) = b³ + 2b² - 3b - 2b² - 4b + 6 = b³ - 7b + 6