\(P=\dfrac{9+6x+x^2-9+6x-x^2-4x^2}{\left(3-x\right)\left(x+3\right)}:\dfrac{2x+1-x-3}{x+3}\)
\(=\dfrac{-4x^2+12x}{3-x}\cdot\dfrac{1}{x-2}=\dfrac{4x}{x-2}\)
P)(9-x)(x^2+2x-3) n)(-x+3)(x^2+x+1) O)(-6x+1/2)(x^2-4x+2) q)(6x+1)(x^2-2x-3) r)(2x+1)(-x^2-3x+1) U)(2x-3)(-x^2+x+6) s)(-4x+5)(x^2+3x-2) V)(-1/2x+3)(2x+6-4x^3)
Bài 3.
1.A=(x-3).(x+3)+15-x^2
2. B=(x-1).(x^2+x+1)-x.(x^2+2)+2x
3. C=92x-1).(4x^2+2x+1 ) -x.(8x2 +1)+x
4.(2x-3).(4x^2+6x+9)-2x.(4x^2-1)=2x-27
5. (x-3).(x^2+3x+9)=x^3-27
ghi rõ cách làm nha
c)C=x(2x+1)-x^2(x+2)+x^3-x+3
d)(2x+3)(4x^2-6x+9)-2(4x^3-1)
e) (4x-1)^3-(4x-3)(16x^2+3)
f) (x+1)^3-(x-1)^3-6(x+1)(x-1)
1) (x^3 - x^2)- 4x^2 + 8x - 4 = 0
2) 2x^3 - 50x = 0
3) (x + 1) = ( x + 1)(x - 1)
4) ( 3x+1)^2-4(X-3)^2=0
5)(X+3)(X^2-5X+9)-X^3=2X
6) (4X+3)^2-(4X-3)^2-5X-2=0
7)(X-1)^3-(X-3)(X^2+3X+9)-3X(2-X)=5
Rút gọn biểu thức:
a, 3(x-y)^2-2(x-y)^2+(x-y)(x+y)
b, (x-2)(x^2+2x+4)-x(x-2)(x+2)+4x
c, 2(2x+5)^2-3(4x+1)(1-4x)
d, 4x^2-12+9/9-4x^2
e, x^4+x^3+x+1/x^4-x^3+2x^2-x+1
a)9x2 – 49 = 0
b)(x – 1)(x + 2) – x – 2 = 0
c)(4x + 1)(x - 2) - (2x -3)(2x + 1) = 7
d)x(3x + 2) + (x + 1)2 – (2x – 5)(2x + 5) = 0
e)(x + 3)(x2 – 3x + 9) –x(x – 1)(x + 1) – 27 = 0
f)(4x-3)^2-3x(3-4x)=0
B1: quy đồng mẫu số các phân thức:
a. 5/ 6x^2y ; 7/ 12xy^2 ; 11/ 18xy
b. 4x+2/ 15x^3y ; 5y - 3/ 9x^2y ; x+1/5xy^3
c. 3/2x ; 3x-3/2x-1 ; 3x-2/2x- 4x^2
d. x^3 + 2x / x^3+1 ; 2x/ x^2 - x +1 ; 1/ x+1
e. y/ 2x^2 - xy ; 4x/ y^2 - 2xy
f. 1/x+2 ; 3/ x^2 - 4 ; x-14/ ( x^2 + 4x + 4 ) (x-2)
g. 1/x+2 ; 1/ (x+2)(4x+7) ;
h. 1/x+3 ; 1/ (x+3)(x+2) ; 1/ (x+2)(4x+7)
B2: dùng quy tắc đổi dấu để tìm mẫu thức chung :
a.4/ x+2 ; 2/x-2 ; 5x-6/4-x^2
b. 1-3x/2x ; 3x-2/2x-1 ; 3x-2/2x-4x^2
c. 1/ x^2 + 6x + 9 ; 1/ 6x-x^2-9 ; x/ x^2 -9
d. x^2 + 2/ x^3 - 1 ; 2/ x^2 + x +1 ; 1/ 1-x
e. x/ - 2y ; x/ x+2y ; 4xy/ 4y^2 - x^2
Ai làm xong trước mình tick nha!
Tìm x biết:
a, 16x² – 9(x + 1)²= 0
b, x2 (x – 1) – 4x2 + 8x – 4 = 0
c, x(2x – 3) – 2(3 – 2x) = 0
d, (x – 3)(x² + 3x + 9) – x(x + 2)(x – 2) = 1
e, 4x² + 4x – 6 = 2
f, 2x² + 7x + 3 = 0
b) ( x+2 ) 2 - (x-2 ) (x+1)=3
c) (2x +1 )2 - ( 4x +1) (x-3) = -3
d) ( 2x -1 )2 - ( 2x -3) (2x +3) = 3
e) ( 3x -2 ) ( x+9 ) - ( 3x -1)2 + 6x2 = 4x +1
f) ( x-3) (x + 3) - (x -1 )2 = 4x +1
Tìm x:
a) (x-1) - (x+1) - (x-2) = 5
b) (2x-1) mũ 2 - (2x+3) mũ 2 = 7
c) (4x-3).(4x+3) - (4x-1) mũ 2 = 8
d) (2x+1).(2x-1) - (2x+3) = 9
