( x - 2 )( x + 2 ) - ( x + 3 )( x2 - 3x + 9 ) = 6x - 27
<=> x2 - 4 - ( x3 + 27 ) = 6x - 27
<=> x2 - 4 - x3 - 27 = 6x - 27
<=> x2 - 4 - x3 - 27 - 6x + 27 = 0
<=> -x3 + x2 - 6x - 4 = 0
Gồi đến đây là chịu :)
Các câu hỏi tương tự
Tìm x,biết:
a)6x2-(2x+5).(3x-2)=-12
b)(x+3).(x2-3x+9)-x.(x2+2)=12-5x
c)x2-25=6x-9
Tìm x, biết:a)
(
x
+
3
)
2
+ (4 - x)(x + 4) 1;b)
(2 - x)
3
+(3 +x)(9 - 3x +
x
2
) + 6x(1 - x) 17;c)
x
4
- 2
x
2
+1 0.
Đọc tiếp
Tìm x, biết:
a) ( x + 3 ) 2 + (4 - x)(x + 4) = 1;
b) (2 - x) 3 +(3 +x)(9 - 3x + x 2 ) + 6x(1 - x) = 17;
c) x 4 - 2 x 2 +1 = 0.
8 tháng 12 2021 lúc 23:47
tìm GTNN
C=\(\dfrac{x^6+27}{\text{x}^4-3x^3+6x^2-9x+9}\)
Tìm x, biết:
a)(x+3)3-x(3x+1)2+(2x+1)(4x2-2x+1)-3x2=54
b)(x-3)3-(x-3)(x2+6x+9)+6(x+1)2+3x2=-33
Tìm x, biết:
a.(x-3).(x+3)=(x-5)^2
b.(2x+1)^2-4x.(x-1)=17
c.(3x-2).(3x+2)-9.(x-1).x=0
d.(3-x)^3-(x+3)^3=36x^2-54x
e.x^3-6x^2+12x-8=27
Tìm x, biết:a) 3x(x - 1) + x - 1 0;b) (x - 2)(
x
2
+ 2x + 7) + 2(
x
2
- 4) - 5(x - 2) 0;c)
(
2
x
-
1
)
2
- 25 0;d)
x
3
+ 27 + (x + 3)(x - 9) 0.
Đọc tiếp
Tìm x, biết:
a) 3x(x - 1) + x - 1 = 0;
b) (x - 2)( x 2 + 2x + 7) + 2( x 2 - 4) - 5(x - 2) = 0;
c) ( 2 x - 1 ) 2 - 25 = 0;
d) x 3 + 27 + (x + 3)(x - 9) = 0.
BÀI 5 : CHO
E=\(\frac{x^2+6x+9}{x^3+3x^2-27x+27}\). \(\left(\frac{x^2+6x+9}{x^3+3x^2-27x+27}+\frac{2}{3x}:\left(\frac{1}{x}+\frac{1}{3}\right)^2\right)\)
F=\(\frac{3+x}{3-x}\) .\(\frac{x^2-6x+9}{9x^2}\).\(\left(\frac{3}{3-x}-\frac{9}{27+x^3}.\frac{x^2-3x+9}{3-x}\right)\)
a, RÚT GỌN E VÀ F
Thực hiện phép tính:
a,4.(x+3)/3x2-x : x2+3x/1-3x
b, x+1/x2-2x-8 . 4-x/x2+x
c, 9x+5/2(x-1)(x+3)2- 5x-7/2(x-1)(x+3)2
d, 18/(x-3)(x2-9)-3/x^2-6x+9-x/x^2-9
e, 1/x2-x+1+1/1-x2+2/x3+1
\(\left(\frac{X^2+3X}{X^3+3X^2+9X+27}+\frac{3}{X+9}\right):\left(\frac{1}{X-3}-\frac{6X}{X^3-3X^2+9X-27}\right)\)