Các câu hỏi tương tự
d.\(\dfrac{12x+1}{11x-4}+\dfrac{10x-4}{9}=\dfrac{20x+17}{18}\) e.\(\dfrac{11}{x}=\dfrac{9}{x+1}+\dfrac{2}{x-4}\) f.\(\dfrac{14}{3x-12}-\dfrac{2+x}{x-4}=\dfrac{3}{8-2x}-\dfrac{5}{6}\)
d.\(\dfrac{12x+1}{11x-4}+\dfrac{10x-4}{9}=\dfrac{20x+17}{18}\) e.\(\dfrac{11}{x}=\dfrac{9}{x+1}+\dfrac{2}{x-4}\) f.\(\dfrac{14}{3x-12}-\dfrac{2+x}{x-4}=\dfrac{3}{8-2x}-\dfrac{5}{6}\)
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
Làm tính chia:a)
x
8
:
x
7
; b)
36
x
7
:
12
x
4
;c)
(
-
x
)
9
:
(...
Đọc tiếp
Làm tính chia:
a) x 8 : x 7 ; b) 36 x 7 : 12 x 4 ;
c) ( - x ) 9 : ( - x ) 5 ; d) 32 ( - y ) 8 : ( - 2 y 4 ) .
a.dfrac{4x-5}{x-1}2+dfrac{x}{x-1} b.dfrac{7}{x+2}dfrac{3}{x-5} c.dfrac{2x+5}{2x}-dfrac{x}{x+5}0d.dfrac{12x+1}{11x-4}+dfrac{10x-4}{9}dfrac{20x+17}{18} e.dfrac{11}{x}dfrac{9}{x+1}+dfrac{2}{x-4} f.dfrac{14}{3x-12}-dfrac{2+x}{x-4}dfrac{3}{8-2x}-dfrac{5}{6}m.dfrac{12}{1-9x^2}dfrac{1+3x}{1+3x}-dfrac{1+3x}{1-3x} n.dfrac{x+1}{x-1}-dfrac{x-1}{x+1}dfrac{16}{x^2} e.left(1-dfrac{x-1}{x+1}right)left(x+2right)dfrac{x+1}{x-1}+dfrac{x-1}{x+1}
Đọc tiếp
a.\(\dfrac{4x-5}{x-1}=2+\dfrac{x}{x-1}\) b.\(\dfrac{7}{x+2}=\dfrac{3}{x-5}\) c.\(\dfrac{2x+5}{2x}-\dfrac{x}{x+5}=0\)
d.\(\dfrac{12x+1}{11x-4}+\dfrac{10x-4}{9}=\dfrac{20x+17}{18}\) e.\(\dfrac{11}{x}=\dfrac{9}{x+1}+\dfrac{2}{x-4}\) f.\(\dfrac{14}{3x-12}-\dfrac{2+x}{x-4}=\dfrac{3}{8-2x}-\dfrac{5}{6}\)
m.\(\dfrac{12}{1-9x^2}=\dfrac{1+3x}{1+3x}-\dfrac{1+3x}{1-3x}\) n.\(\dfrac{x+1}{x-1}-\dfrac{x-1}{x+1}=\dfrac{16}{x^2}\) e.\(\left(1-\dfrac{x-1}{x+1}\right)\left(x+2\right)=\dfrac{x+1}{x-1}+\dfrac{x-1}{x+1}\)
1) Làm tính nhân: a) (3-2*x+4*x^2)*(1+x-2*x^2). b) (a^2+a*x+x^2)*(a^2-a*x+x^2)*(a-x). 2) Cho đa thức: A=19*x^2-11*x^3+9-20*x+2*x^4. B=1+x^2-4*x Tìm đa thức Q và R sao cho A=B*Q+R. 3) Dùng hằng đẳng thức để làm phép chia: a) (4*x^4+12*x^2*y^2+9*y^4):(2*x^2+3*y^2). b) ( 64*a^2*b^2-49*m^4*n^2):(8*a*b+7*m^2*n). c) (27*x^3-8*y^6):(3*x-2*y^2)
21 tháng 8 2016 lúc 20:49
Cho xin N.Chứng minh frac{A}{B}in Nkhi :a) A x9999 + x8888 + x7777 + ... + x1111 + 1 ; B x9 + x8 + x7 + ... + x + 1b) A (x + 1)(x + 3)(x + 5)(x + 7) + 15 ; B x2 + 8x + 12c) A x17 - x ; B x2 + 1d) A 8x9 - 9x8 + 1 ; B x2 - 2x + 1
Đọc tiếp
Cho \(x\in N\).Chứng minh \(\frac{A}{B}\in N\)khi :
a) A = x9999 + x8888 + x7777 + ... + x1111 + 1 ; B = x9 + x8 + x7 + ... + x + 1
b) A = (x + 1)(x + 3)(x + 5)(x + 7) + 15 ; B = x2 + 8x + 12
c) A = x17 - x ; B = x2 + 1
d) A = 8x9 - 9x8 + 1 ; B = x2 - 2x + 1
a)\(x+\left(x+1\right)+\left(x+3\right)+...+\left(x+2003\right)=2004\)
b)
\(\left(x+2\right)^2=\frac{1}{2}-\frac{1}{3}\)
c)\(\left(2x+1\right)^2=25\)
d)\(\frac{x-6}{7}+\frac{x-7}{8}+\frac{x-8}{9}=\frac{x-9}{10}+\frac{x-10}{11}+\frac{x-11}{12}\)
TÌM X BiẾT:
Làm 1Cau giúp mình cũng đuoc
Tìm x, biết:a)
x
2
(x - 5) + 5 - x 0; b) 3
x
4
- 9
x
3
-9
x
2
+ 27x;c)
x
2
(x + 8) +
x
2
-8x; d) (x + 3)(
x
2
-3x + 5)
x
2...
Đọc tiếp
Tìm x, biết:
a) x 2 (x - 5) + 5 - x = 0; b) 3 x 4 - 9 x 3 = -9 x 2 + 27x;
c) x 2 (x + 8) + x 2 = -8x; d) (x + 3)( x 2 -3x + 5) = x 2 + 3x.
tìm x biết
a)3x3-12x=0
b)(x-3)2-(x-3)(3-x)2=0
c)4(x+1)+(2x+1)2-8(x-1)(x+1)=11
d)(x+3)(x2-3x+9)-x(x-4)(x+4)