<span><span>3.6(2y-1)-4(3y-1)-5.5(x+3)+7(x+y-5)=7,2y-3,6-12y+4-5,5x-16,5+7x+7y-35=2,2y-51,1+1,5x
-----------------------------------------------------------------------------------------------------------------------------
2.6(4-2b)-7.6(a-2)-5(6b-a+20)
=10,4-5,2b-7,6a+15,2-30b+5a-100=-74,4-35,2b-2,6a
---------------------------------------------------------------------------------------------------------------------
</span>8x-3x-6x= - 7.3
x=7,3
3x-2.5x+3+x - 1.3 = 0
1,5x=-1,7
x=-1 2/15
<span>x-4.5x+3x-4.7+5.8 = 0
0,5x=4,7-5,8
0,5x=-1,1
x=-2,2
</span>
<span>-2x +5.5x-4.1+8 - 0.5x = 0
3x=4,1-8
3x=-3,9
x=-1,3
</span></span>
<span><span>7(x-3)-4(x-5)+8= 7х-21-4х+20+8=3x+7
-6(a-b)-2(3b+2a)-23a=-6а+6b-6b-4a-23a=-33a
</span>
</span>
1/3 и 1/2 2/6 и 3/6
3/8 и 1/4 3/8 и 2/8
3/4 и 5/6 9/12 и 10/12
1/4*4/9=1/9
1/7*2=1/14
2 2/5*5/6=12/5*5/6=2
(1/5+2/15)*3/4=1/3*3/4=1/4
(1/2-1/3)*6=1/6*6=1
(1/7*2 1/3)-исправь ошибку.
5ц=500кг
1)500+50=550(кг)-каркас.
2)550-110=440(кг)-покрытие.
3)550+440=990(кг)-масса шатра.
Ответ:990кг
1) ? а бульдозер не нужно ?
2) MN = √[(xN-xM)²+(yN-yM)² +(zN-zM)²] ⇒
A1A2=√[(3-1)²+(2-1)²+(1-(-1))²] = √(4+1+4) = 3
A1A4)=√[(3-1)²+(0-1)²+(1-(-1))²]= 3
A1A3=√[(0-1)²+(3-1)²+(0-(-1))²] = √6
A2A3=√[(0-3)²+(3-2)²+(0-1)²] = √11
A2A4=√[(3-3)²+(0-2)²+(1-1)²]= 2
A3A4= √[(3-0)²+(0-3)²+(1-0)²] = √19
3) Вектор → А1А2= →a = (3-1; 2-1; 1-(-1)) = (2;1 ; 2)
→ A1A4= →b =((3-1; 0-1; 1-(-1)) = (2; -1; 2)
cos(a;b)= (a,b)/{IaI·IbI] = [(2·2+1·(-1)+2·2)]/(3·3)= 7/9
Срочный вызов, извени
