\(=\dfrac{4x+7+1}{\left(x+2\right)\left(4x+7\right)}=\dfrac{4\left(x+2\right)}{\left(x+2\right)\left(4x+7\right)}=\dfrac{4}{4x+7}\)
\(=\dfrac{4x+7+1}{\left(x+2\right)\left(4x+7\right)}=\dfrac{4\left(x+2\right)}{\left(x+2\right)\left(4x+7\right)}=\dfrac{4}{4x+7}\)
BT: Giải các phương trình
a) 4x+5/x-1 + 2x-1/x+1 = 6
b)x+2/x-3 + x-2/x+3 = 2(x^2 + 6)/x^2-9
c)1/x-1 + 3 = 3x-2/x+2
d) 8/x+1 + 1/x-1 = 9/x
e)(4x+1)(3x+7/3-5x + 1)= (x-4)(3x+7/5x-3 - 1)
f) (x^2 + 3x + 1)(4x-3/3x+1 + 2)= (4x+7)(4x-3/3x+1 + 2)
Mọi người giúp mìnnn vớiii
làm các phép tính sau
a,y/2x2-xy + 4x/y2-2xy
b,1/x+2 + 3/x2-4 + x-14/(x2+4x+4) (x-2)
c,1/x+2 + 1/(x+2)(4x+7)
d,1/x+3 + 1/(x+3) (x+2) + 1/(x+2)(4x+7)
tìm x
1,(2x+3)^2+(2x+1)(2x-1)=22
2,(4x+3)(4x-3)=46+(4x-5)^2
3,(2x-1)^3-4x^2(2x-3)=5
4,(x+4)^2-(x-1)(x+1)=16
5,(2x-1)^2+(x+3)^2=5(x+7)(x-7)+325
6,(x^2+1)^2-(x^4+x^2+1)(x^2-1)=0
Giải phương trình:
a) (x^2+3x+1).((4x-3)/(3x+1)+2)=(4x+7).((4x-3)/(3x+1)+2)
b) (x-1)/(x+2)-x/(x-2)=(5x-2)/(4-x^2)
a)(2x+1)^2-(4x+1)(x-2)
b)(x+7)(x-4)=2(x-4)
c)(3x-1^2)=16
d)4x^2-3x-1=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!
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
Thu gọn biểu thức:
a)2x(x+7)-(x+3)(x-3)-(2x-5)^2
b)(x-2)(x+2)-4x(x-3)+(2x-7)^2
c)(4x-1)^3-(4x-3)(16x+3)
d)(2x-1)^3-(4x+1)^3
1) Rút gọn
x2 + 4x +4 \ 3x + 6 ; 12x + 3x \ 2x(x + 4)
2) Quy đồng mẫu
a/ 6 \ x2 + 4x ; 3 \ 2x + 8
b/ 1 \ x + 2 ; 1 \ (x + 2)(4x +7)
c/ y - 12 \ 6y - 36 ; 6 \ y2 - 6y
d/ 1 \ x + 3 ; 1 \ (x + 3)(x + 2) ; 1 \ (x + 2)(4x + 7)
1:(4x+1)(x-3)-(x-7)(4x-1)=15
2:(X+1)(X2 -X+1)-X(X2+3)+4