7 5/22-3 2/11 = 7 5/22-3 4/22=4 1/22
9х+2у=-8
9х-2у=-28
4у=20
у=5
9х+2*5=-8
9х=-18
х=-2
Ответ:(-2;5)
Переносим неизвестное влево, ивестное вправо
-6х-2х=21+11
-8х=32
х=32:(-8)
х=-4
Ответ во вложении
Если ответ не подходит, я могу решить другим способом.
<span>f(x)=<span>x4</span>−6⋅<span>x2</span>+7</span>
Решение.
<span><span>
f′</span>(x)=<span><span>(<span>x4</span>−6⋅<span>x2</span>+7)</span>′</span>=</span><span><span><span>(<span>x4</span>−6⋅<span>x2</span>)</span>′</span>=</span><span><span><span>(<span>x4</span>)</span>′</span>−<span><span>(6⋅<span>x2</span>)</span>′</span>=</span><span>4⋅<span>x3</span>−6⋅<span><span>(<span>x2</span>)</span>′</span>=</span><span>4⋅<span>x3</span>−12⋅x</span>
Ответ:
<span><span>f′</span>(x)=4⋅<span>x3</span>−12⋅<span>x</span></span>