-х^2+5х=6
-x^2+5x-6=0
D=(-1)^2 - 4*5*(-6)=1+120=121
x1,2=(-5+-√121)/2*(-1)=(-5+-11)/-2
x1=(-5+11)/-2=6/-2=-3
x2=(-5-11)/-2=-16/-2=8
9 2/7 = (9*7 + 2)/7 = 65/7
1 7/9 = (1*9 + 7)/9 = 16/9
2 2/5 = (5*2 + 2)/5 = 12/5
1 1/3 = (1*3 + 1)/3 = 4/3
65/7 + 16/9 : (12/5 - 4/3) * 3/7 =
= 65/7 + 16/9 * 15/16 * 3/7 =
= 65/7 + 15/21 =
= 195/21 + 15/21 =
= 210/21 = 10
X^3 + X^2 = 9X + 9
X^2 * ( X + 1 ) = 9 * ( X + 1)
( X^2 - 9 ) * ( X + 1 ) = 0
X^2 - 9 = 0 ---> X^2 = 9 ---> X1 = + 3 ; X 2 = ( - 3 )
X + 1 = 0 ---> X + ( - 1 )
Ответ: ( - 1 ) ; ( - 3 ) ; + 3
3x(x-1)-(x-1)=0
(x-1)(3x-1)=0
x-1=0 3x-1=0
x=1 3x=1
x=1/3
Ответ: 1/3; 1.