\(x=-\dfrac{1}{2}=-0.5,y=\dfrac{5}{4}=1.25\\x=2,y=\dfrac{7}{2}=3.5\)
Tìm x, y, z biết:
\(\dfrac{x-1}{2}=\dfrac{y+3}{4}=\dfrac{z-5}{6}\) và \(5z-3x-4y=50\)
Tìm hai số x,y biết
a/\(\dfrac{x^3}{8}=\dfrac{y^3}{27}=\dfrac{z^3}{64};x^2+2y^2-3z^2=-650\)
b/\(\dfrac{x-1}{2}=\dfrac{y+3}{4}=\dfrac{z-5}{6};5z-3x-4y=50\)
a, 3x = 2y ; 5y = 8z và x - y + z = 35
b, 3x = 2y ; 5z = 2x và x . y = 24
c, 3x = 4y = 5z và 2x + 3y - 4z = 74
d, \(\dfrac{x}{y}=\dfrac{8}{15};\dfrac{y}{z}=\dfrac{5}{6}và\dfrac{x}{4}-\dfrac{y}{3}+\dfrac{z}{2}=12\)
e, \(\dfrac{x}{5}=\dfrac{y}{4}=\dfrac{z}{6}\)và x.y.z = 960
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Cho các số x, y, z thỏa mãn \(\dfrac{3x-2y}{4}=\dfrac{2z-4x}{3}=\dfrac{4y-3x}{2}\)
Tính giá trị của biểu thức \(A=\dfrac{2x+2y+20z}{x+y+z}\)
3, a, Cho \(\dfrac{2x-y}{3x+2y}=\dfrac{5}{2}\) . Tính P= \(\dfrac{5x+4y}{25x-y}\)
b, Cho \(\dfrac{x-5y}{x-3y}=\dfrac{4}{3}\) . Tính P= \(\dfrac{x^3+2y^3}{x^3-y^3}\)
\(\dfrac{2x}{5}=\dfrac{y}{9}=\dfrac{z}{7}\) và y-z=10
\(\dfrac{x}{y}=\dfrac{2}{5}\) và x-y=15
Tìm x:
1) \(\dfrac{1,2}{30}\)\(=\dfrac{3x+4}{50}\)
2) \(\dfrac{x-1}{x-5}\)\(=\dfrac{6}{7}\)
3) \(\dfrac{x-1}{3}\)\(=\dfrac{x+3}{5}\)
4) \(\dfrac{3}{7}\)\(=\dfrac{2x+1}{3x+5}\)
5) \(\dfrac{2x+3}{3x+1}\)\(=\dfrac{3}{4}\)
6) \(\dfrac{2x+3}{6}\)\(=\dfrac{7x-3}{15}\)
7) \(\dfrac{6x-5}{-7}\)\(=\dfrac{5x-3}{-5}\)
8) \(\dfrac{x+1}{x-2}\)\(=\dfrac{3}{4}\)
9) \(\dfrac{2x-3}{x+1}\)\(=\dfrac{4}{7}\)
10) \(\dfrac{2x+3}{7}\)\(=\dfrac{4x-1}{15}\)
11) \(\dfrac{2x+3}{24}\)\(=\dfrac{3x-1}{32}\)
12) \(\dfrac{2x+4}{7}\)\(=\dfrac{4x-2}{15}\)
13) \(\dfrac{11x-2}{7x+5}\)\(=\dfrac{11}{8}\)
14) \(\dfrac{12-7x}{-13}\)\(=\dfrac{4-3x}{-5}\)
15) \(\dfrac{52}{2x-1}\)\(=\dfrac{13}{30}\)
bài tìm x,y,z biết :a)\(\dfrac{x}{5}=\dfrac{y}{6};\dfrac{y}{8}=\dfrac{z}{7}\)và x+y-z=69
b)\(\dfrac{x}{3}=\dfrac{y}{4};\dfrac{y}{3}=\dfrac{z}{5}\)và 2x-3y+z=6
c)\(\dfrac{x}{2}=\dfrac{y}{5}=\dfrac{z}{6}\)và x+y=14
d)\(\dfrac{2}{3x}=\dfrac{1}{2y}=\dfrac{2}{z}\)và 3x+2y+z=1
\(\dfrac{x}{3}\)=\(\dfrac{y}{8}\)=\(\dfrac{z}{5}\) và 2x + 3y - z = 50
