Ответ:
Пошаговое объяснение:
1) -20a + 18a = -2a
-2a +40 при а= 50 -2*50 + 40 = - 60
2) 9,4b - 10b = 0.6b
0.6b - 13 при b = 15 0.6 * 15 - 13 = -4
3) -14 1/7 c + 18 2/7 c = 22/7 c
22/7 c -12 при с = 1.4 22/7 * 1.4 -12 = -38/5 = - 7.6
4)9x + 16x = 25x
-10y + 9y = -y
25x - y при x= 0.8 y= 2.5 25*0.8 - 2.5 = 17.5
5) -1.4a - 2.6a = - 4a
31b+4b = 35b
35b - 4a при a= 1.4 b= -0.2 35*(-0.2) - 4 * 1.4 = -12.6
Для составления уравнения плоскости используем формулу:
<span><span>x - xA </span><span>y - yA </span><span>z - zA</span></span>
<span><span>xB - xA </span><span>yB - yA </span><span>zB - zA</span></span>
<span><span>xC - xA </span><span>yC - yA </span><span>zC - zA</span></span> = 0
Подставим данные и упростим выражение:
<span><span>x - (-1) </span><span>y - 4 </span><span>z - 3</span></span>
<span>3 - (-1) 6 - 4 2 - 3</span>
<span>2 - (-1) (-5) - 4 (-3) - 3</span> = 0
<span><span>x - (-1) </span><span><span>y - </span>4 </span><span><span>z - </span>3</span></span>
<span> 4 2 -1</span>
<span> 3 -9 -6</span> = 0
<span>(x - (-1))*(</span>2·(-6)-(-1)·(-9))<span> - (</span><span><span>y - </span>4)*(</span>4·(-6)-(-1)·3)<span> + </span><span><span>(z - </span>3)*(</span>4·(-9)-2·3)<span> = 0</span>
(-21)<span>x - (-1)</span> + 21<span>y - 4</span> + (-42)<span>z - 3</span> = 0
- 21x + 21y - 42z + 21 = 0
x - y + 2z - 1 = 0
{x≥-3
{x<4.75
[-3;4.75)-answer
Решай по действиям и всё и не надо не каких столбиков
4,32-2,493=1,827
1,827+84,63=86,457