Ta có:
3/4<|3/20-x|<4/5
=>Ta có 2 trường hợp sau:
TH1:
3/4<3/20-x<4/5
=>3/4+3/20<3/20-x+3/20<4/5+3/20
=>9/10<x<19/20
TH2:
-3/4>-(3/20-x)>--4/5
=>-3/4+3/20>-3/20+x+3/20>-4/5+3/20
=>-3/5>x>-13/20
Vậy 9/10<x<19/20 hoặc -3/5>x>-13/20
Ta có:
3/4<|3/20-x|<4/5
=>Ta có 2 trường hợp sau:
TH1:
3/4<3/20-x<4/5
=>3/4+3/20<3/20-x+3/20<4/5+3/20
=>9/10<x<19/20
TH2:
-3/4>-(3/20-x)>--4/5
=>-3/4+3/20>-3/20+x+3/20>-4/5+3/20
=>-3/5>x>-13/20
Vậy 9/10<x<19/20 hoặc -3/5>x>-13/20
Tìm x, biết:
2/(x-1)(x-3)+5/(x-3)(x-8)+12/(x-8)(x-20)-1/x-20=-3/4
tìm x, biết:
a/ x+4/20 = 5/x+4
b/ x-1/x+2 = x-2/x+3
Bài 1:Tìm x biết
a, 3/x = 4/-12
b,5/7 = x/35
c,-10/3 = 20/x
d,x+4/x-2 = 5/7
Tìm X biết :
a} |x-1/3| + 4/5 = [{-3,2} + 2/5]
b} x/2 = y/3 = z/4 và x + 2y -3z = 20
c} x-1-/2 = y-2/3 = z-3/4 và x - 2y + 3z
Tìm x,biết:
a,3 / (x+2).(x+5) + 5 / (x+5).(x+10) + 7 / (x+10) . (x+17)= x / (x+2).(x+17)
x∉{-2 ; -5 ;-10 ; -17}
b,2 / (x-1). (x-3)+5 / (x-3).(x-8)+12 / (x-8).(x-20)-1 / x-20=-3/4
x∉{1;3;8;20}
c,x-1/2009 + x-2/2008 = x-3/2007 + x-4 / 2006
Tìm x, biết:
a) 3/(x+2)(x+5) + 5/(x+5)(x+10) + 7/ (x+10)(x+7) = x/(x+2)(x+17) với x thuộc {-2,-5,-10,-17}
b) 2/(x-1)(x-3 + 5/(x-3)(x-8) + 12/(x-8)(x-20) -1/x-20 =-3/4 với x thuộc {1,3,8,,20}
tìm x, biết:
a/ x+4/20 = 5/x+4
b/ x-1/x+2 = x-2/x+3
Tìm x, biết:
a) |x-1/5| = |-5/2| - |1/4 - 2/3|
b) (x-0,5).(x^2 - 1,96) = 0
c) 5/6:x = 20 : 3
Tìm x, biết:
a) \(\dfrac{1}{20}\) - (x - \(\dfrac{8}{5}\)) = \(\dfrac{1}{10}\)
b) \(\dfrac{7}{4}\) - (x + \(\dfrac{5}{3}\)) = \(\dfrac{-12}{5}\)
c) x - [\(\dfrac{17}{2}\) - \(\left(\dfrac{-3}{7}+\dfrac{5}{3}\right)\)] = \(\dfrac{-1}{3}\)