9 × а^8 × b^14 / (-3 × a^3 × b^4)^3 =
9 × а^8 × b^14 / -9 × a^9 × b^12 =
-1 × (a^-1 × b^2) =
-1 × (1/a × b^2) =
-1 × (b^2/a) =
-b^2/a
3)= 3с6/а2
4)=2ab-(a2+2ab+b2)+2a2=2ab-a2-2ab-b2+2a=a2-b2=(a-b)(a+b) Д. Т.
5)x2(x+3)-9(x+3)=0
(x+3)*(x2+9)=0
x+3=0 x=-3
x2-9=0 x=±3
x=3,x=-3
5( x + 6) = 2x
5x + 30 = 2x
5x - 2x = - 30
3x = - 30
x = - 30/3
x = - 10
6( x - 3) = 2 ( 3x + 8)
6x - 18 = 6x + 16
6x - 6x = 18 + 16
0x = 34 - решений нет,так как на 0 делить нельзя.Корней нет.
2( 6 - 2x) = 3( 7 - 4x)
12 - 4x = 21 - 12x
- 4x + 12x = - 12 + 21
8x = 9
x = 9/8
x = 1,125
5( x + 5) = 3( x + 3)
5x + 25 = 3x + 9
5x - 3x = - 25 + 9
2x = - 16
x = - 16/2
x = - 8
Xy-xm-6y+6m= x(y-m)-6(y-m) = (y-m)(x-6)
81*0-15у+225=0
0-15у+225=0
-15у+225=0
-15у=-225
у=225/15
у=15