Ответ:
1)3
2)1
3)-3
4)1.7
5)-8
6)нет решения
Объяснение:
1)x=18/1*1/6=18/6=3
2)6x-3x=0.8+2.2 3x=3 x=1
3)(-3+3)=0*n=0
4)7x=-11.9 -11.9/7=1.7
5)5x-7x-7=9 -2x=16 x=-8
6)6x-2x+5=4x+8 6x-6x=13 0≠13
Х1=1/7 х2=1/3
х²+px+q=0
p=-(x1+x2)=-(1/7+1/3)=-(3/21+7/21)=-10/21
q=[1*[2=1/7*1/3=1/21
x²-10/21*x+1/21=0
21x²-10x+1=0
1)
(9x -7)/4 -(9x+13)/8=3x-(x/2)
(2(9x-7) -9x+13)/8 =(6x -x)/2
(18x -14 -9x +13)/8 =5x/2
(9x -1)/8 -5x/2 =0
(9x -1 -5x*4)/8 =0
9x -1 -20x =0
-11x =1
x = -1/11
2)
(6x+7)/6 +(5x -8)/9 =3
(3(6x +7) +2(5x -8))/18 =3
18x +21 +10x -16 =3*18
28x +5 =54
28x =54 -5
28x =49
x =49/28
x =1.75
G(x^2 - x) = 1 - lg5
<span>lg(x^2 - x) = lg10 - lg5 = lg(10/5) = lg2 </span>
<span>x^2 - x = 2 </span>
<span>два решения, x = -1 и x = 2</span>