Ta có :
`(x-y-z)/(5-6-2)=2/-3`
`=>x/5=-2/3`
`<=>x=-10/3`
`=>y/6=-2/3`
`<=>y=-4`
`=>z/2=-2/3`
`<=>z=-4/3`
Những câu như này đơn giản mà bạn ?
Ta có :
`(x-y-z)/(5-6-2)=2/-3`
`=>x/5=-2/3`
`<=>x=-10/3`
`=>y/6=-2/3`
`<=>y=-4`
`=>z/2=-2/3`
`<=>z=-4/3`
Những câu như này đơn giản mà bạn ?
Tìm x, y, z, t ∈ Z biết:
a, \(\dfrac{5}{x}=\dfrac{-10}{12}\) b, \(\dfrac{4}{-6}=\dfrac{x+3}{9}\) c, \(\dfrac{x-1}{25}=\dfrac{4}{x-1}\) d, \(\dfrac{x+1}{y}=\dfrac{-3}{5}\)
e, \(\dfrac{-12}{6}=\dfrac{x}{5}=\dfrac{-y}{3}=\dfrac{Z}{-17}=\dfrac{-t}{-9}\)
h, \(\dfrac{-24}{-6}=\dfrac{x}{3}=\dfrac{4}{y^2}=\dfrac{Z^3}{-2}\)
$\dfrac{x-1}{2}$=$\dfrac{y+3}{4}$=$\dfrac{z-5}{6}$ và 5z - 3x - 4y = 50
1. tìm các số chưa biết :
a) \(\dfrac{4}{3}\)= \(\dfrac{8}{x}\)=\(\dfrac{-y}{21}\)=\(\dfrac{-40}{z}\)=\(\dfrac{16}{t}\)=\(\dfrac{y}{111}\)
b) \(\dfrac{-7}{6}=\dfrac{x}{18}=\dfrac{-98}{y}=\dfrac{14}{y}=\dfrac{-14}{z}=\dfrac{t}{102}=\dfrac{4}{-78}\)
2. tìm x biết :
a) \(\dfrac{2}{x}=\dfrac{x}{8}\)
b) \(\dfrac{2x-9}{240}=\dfrac{39}{80}\)
c) \(\dfrac{x-1}{9}=\dfrac{8}{3}\)
mn giúp mk nha :>
a) \(\dfrac{12}{16}\) = \(\dfrac{-x}{4}\) = \(\dfrac{21}{y}\) = \(\dfrac{z}{80}\)
b) \(\dfrac{1}{3}\) x + \(\dfrac{2}{5}\) ( x - 1 ) = 0
c) ( 2x - 3 )( 6 - 2x ) = 0
d) \(\dfrac{-2}{3}\) - \(\dfrac{1}{3}\) ( 2x - 5 ) = \(\dfrac{3}{2}\)
e) 2 |\(\dfrac{1}{2}\) x - \(\dfrac{1}{3}\) | - \(\dfrac{1}{4}\)
Tìm x;y ϵ Z sao cho :
\(\dfrac{x}{2}=\dfrac{2}{y}+\dfrac{11}{6}\)
$\dfrac{x}{2}$=$\dfrac{y}{3}$=$\dfrac{z}{5}$ và xyz = -30
\(\dfrac{-3}{6}\) = \(\dfrac{x}{-2}\) = \(\dfrac{-18}{y}\) = \(\dfrac{-z}{24}\)
Tìm x,y,z
giúp mình với ạ
Bài 6: Tìm x,y \(\in\) Z
a,\(\dfrac{x}{7}=\dfrac{9}{y}\) và x>y
b, \(\dfrac{-2}{x}= \dfrac{y}{5}\) và x<0<y
Tìm k nếu x + y = 4, y + 5 =z, z + x =2k, x + y + z = 21
A.-12 B.-6 C.\(\dfrac{43}{6}\) D.7 E.\(\dfrac{51}{7}\)
Tìm x,y ϵ Z biết: \(\dfrac{5}{x}\)- \(\dfrac{y}{3}\)= \(\dfrac{1}{6}\)