\(=\dfrac{3\left(x-7\right)}{-x\left(x-7\right)}=\dfrac{-3}{x}\)
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Các câu hỏi tương tự
3x-21/7x-x^2
Giải các phương trình sau
a ( 3x-1)^2 - (x+3)^2
b x^3-x/49 = 0
c x^2 -7x+12
d 4x^2 -3x -1 =0
e . 29-x/21 + 27-x/23 + 25-x/25 + 23-x/28 + 21-x/29
Bài 1:
a) Max A = (3x^2 + 9x +3) / (x^2 +x +1)
b) Min B = ( 7x^2 +21) / (x^2 + x +2)
a, 3-x=x-5 b, 7x+21=0 c, 0,25x+1,5=0 d, 6,36-5,3x=0
e, 3x+1=7x-11 f, 15-4x=6x+5 g, 2(x+1)=3+2x
h, 3(1-x)+4x-3 = 0
Tìm x , biết :
a. 3x3 - 12x = 0
b. x2 (x - 3) + 12 - 4x = 0
c. (3x - 1)2 - (2x - 3)2 = 0
d. x2 - 4x - 21 = 0
e. 3x2 - 7x - 10 = 0
Tìm x , biết :
a. 3x3 - 12x = 0
b. x2 (x - 3) + 12 - 4x = 0
c. (3x - 1)2 - (2x - 3)2 = 0
d. x2 - 4x - 21 = 0
e. 3x2 - 7x - 10 = 0
Giải phương trình
1) 16-8x=0
2) 7x+14=0
3) 5-2x=0
4) 3x-5=7
5) 8-3x=6
6) 8=11x+6
7)-9+2x=0
8) 7x+2=0
9) 5x-6=6+2x
10) 10+2x=3x-7
11) 5x-3=16-8x
12)-7-5x=8+9x
13) 18-5x=7+3x
14) 9-7x=-4x+3
15) 11-11x=21-5x
16) 2(-7+3x)=5-(x+2)
17) 5(8+3x)+2(3x-8)=0
18) 3(2x-1)-3x+1=0
19)-4(x-3)=6x+(x-3)
20)-5-(x+3)=2-5x
giải các phương trình
a) (3x-2)(3x-1) = (3x+1)2
b) (4x-1)(x+1) = (2x-3)2
c) (5x+1)2 = (7x-3)(7x+2)
d) (4-3x)(4+3x)=(9x-3)(1-x)
e) x(x+1)(x+2)(x+3)=24
g) (7x - 2)2= (7x-3)(7x+2)
Gi ải các phương trình sau
a)x-3(2x-6)=21-(5x+3)
b)(x-2)(x+2)-(x-1)2=2(x+1)
c)\(\dfrac{9x+4}{6}\)=1-\(\dfrac{3x-5}{9}\)
d)\(\dfrac{6x+1}{x^2-7x+10}\)+\(\dfrac{5}{x-2}\)=\(\dfrac{3}{x-5}\)