А) 3х-8=х+6
<span>3*x-8 = x+6
</span>3*x = 14 + x
2*x = 14
<span>x = 14 / (2)
</span>
б) 7а-10=2-4а
<span>7*a-10 = 2-4*a
</span><span>7*a = 12 - 4*a
</span><span>11*a = 12
</span><span>a = 12 / (11)
</span>
в) 1/6y-1/2=3-1/2y
1/6*y-1/2 = 3-1/2*y
<span>y/6 = 7/2 - y/2
</span>2*y/3 = 7/2
<span>y = 7/2 / (2/3)
</span><span>y = 21/4
</span>
г) 2.6-0.2b=4.1-0.5b
(13/5)-(1/5)*b = (41/10)-(1/2)*b
13/5-1/5b = (41/10)-(1/2)*b
13/5-1/5b = 41/10-1/2b
-b/5 = 3/2 - b/2
3*b/10 = 3/2
3/10b = 3/2 / (3/10)
b = 5
д) p-1/4=3/8+1/2p
p-1/4 = 3/8+1/2*p
p = 5/8 + p/2
p/2 = 5/8
/2p = 5/8 / (1/2)
p = 5/4
е) 0.8-y=3.2+y
4/5)-y = (16/5)+y
4/5-y = (16/5)+y
4/5-y = 16/5+y
-y = 12/5 + y
-2*y = 12/5
-2y = 12/5 / (-2)
y = -6/5
ж) 2/7х=1/2
<span>2/7*x = 1/2
</span><span>x = 1/2 / (2/7)
</span>x = 7/4
з) 2х-0,7=0
2*x-(7/10) = 0
2*x-7/10 = 0
2*x = 7/10
2x = 7/10 / (2)
<span> x = 7/20</span>
2xy(3x-2y^2+3xy)*(-3x^2) =
-18х⁴у + 12х³у³ - 18х⁴у²
tga=5\4
sina= 1.25cosa
1.25cosa+cosa (дробная черта) 2*1,25сosa-cosa = 2.25cosa\1.5cosa= 1.5
X^2-8x-84=0
D=64+336=400
x=(8+-20)/2
x1=(8+20)/2=28/2=14
x2=(8-20)/2=-12/2=-6
(x/y^3*(x-2y)/y - (x-y)^2/y^4)^-5 =(x*(x-2y)/y^4 -(x^2-2xy+y^2)/y^4)^-5
=((x^2-2xy-x^2+2xy-y^2)/y^4)^-5 = (-y^2/y^4)-5 = (-1/y^2)^-5 = (-y^2)^5 =
-y^10 вроде бы так
