15-6х-6х+8=2-2х
15+8-2=6х+6х-2х
21=10х
х=21/10
х=2,1
2,1х100:15=14
Ответ: корень от числа 15 составляет 14 %
<span><span><span><span>x2</span>+<span>y2</span></span><span><span>−6</span>x</span></span><span><span>−8</span>y</span></span>=<span><span>−21</span>+<span>0
</span></span><span><span><span><span>x2</span>+<span>y2</span></span><span><span>−6</span>x</span></span><span><span>−8</span>y</span></span>=<span>−<span>21
</span></span><span><span>(<span>x<span>−3</span></span>)</span>2</span><span>−<span>9
</span></span><span><span><span><span><span>(<span>x<span>−3</span></span>)</span>2</span><span>−9</span></span>+<span>y2</span></span><span><span>−8</span>y</span></span>=<span>−<span>21
</span></span><span><span><span><span>(<span>x<span>−3</span></span>)</span>2</span>+<span>y2</span></span><span><span>−8</span>y</span></span>=<span><span>−21</span>+<span>9
</span></span><span><span>(<span>y<span>−4</span></span>)</span>2</span><span>−<span>16
</span></span><span><span><span><span>(<span>x<span>−3</span></span>)</span>2</span>+<span><span>(<span>y<span>−4</span></span>)</span>2</span></span><span>−16</span></span>=<span><span>−21</span>+<span>9
</span></span><span><span><span>(<span>x<span>−3</span></span>)</span>2</span><span><span>(<span>y<span>−4</span></span>)</span>2</span></span>=<span><span><span>−21</span>+9</span>+<span>16
</span></span><span><span><span>(<span>x<span>−3</span></span>)</span>2</span>+<span><span>(<span>y<span>−4</span></span>)</span>2</span></span>=<span><span>−12</span>+<span>16
</span></span><span><span><span>(<span>x<span>−3</span></span>)</span>2</span>+<span><span>(<span>y<span>−4</span></span>)</span>2</span></span>=<span>4</span>
S=V*t, V=S:t
7. 1) 50*2=100 км - пролетел слепень
2) 100:4=25 км/ч - должна быть скорость шершня
8. 1) 90*2=180 км - пролетела колибри
2) 180:3=60 км/ч - должен лететь клест