x- y/3=x+ y/13 =>x-x=y/3+y/13 => 0=y/3+ y/13 => y/-3=y/13
=> y=0 => x bằng tất cả mọi số
x- y/3=x+ y/13 =>x-x=y/3+y/13 => 0=y/3+ y/13 => y/-3=y/13
=> y=0 => x bằng tất cả mọi số
Cho \(\frac{x^{\text{4}}}{a}+\frac{y^{\text{4}}}{b}=\frac{1}{a+b};x^2+y^2=1\)
Chứng minh rằng:\(\frac{x^{200\text{4}}}{a^{1002}}+\frac{y^{200\text{4}}}{b^{1002}}=\frac{2}{\left(a+b\right)^{102}}\)
1) Cho \(\text{(x-y):(x+y):(x.y)=1:7:24}\) . tính x.y
2) Cho \(\frac{3x-4}{y+15}=k\) (k khác 0)biết khi y=3 thì x=2. tìm x khi y=12
3)tìm x biết \(\frac{x}{4}:2=4:\frac{x}{2}\)
Tìm x;y biết rằng : \(\text{|}x-5\text{|}+\text{|}1-x\text{|}=\frac{12}{\text{|}y+1\text{|}+3}\)
\(\frac{y+\text{z}+1}{x}=\frac{x+\text{z}+2}{y}\frac{x+y-3}{\text{z}}=\frac{1}{x+y+\text{z}}\)
Tìm x, y, z
a, \(\frac{x}{3}=\frac{y}{4};\frac{y}{5}=\frac{z}{7}v\text{à}2\text{x}+3y-z=186\)
b, 3x=2y ; 7y = 5z và x-y+z = 32
c,\(\frac{2\text{x}}{3}=\frac{3y}{4}=\frac{4\text{z}}{5}v\text{à}x+y+z=49\)
d, \(\frac{x^3}{8}=\frac{y^3}{64}=\frac{z^3}{216}v\text{à}x^2+y^2+z^2=14\)
e, x+y=x:y= 3.(x-y)
a)\(\frac{z}{5}=\frac{x}{2}=\frac{y}{3}v\text{à}x.y-z=810\)
b)\(5x=3yv\text{à}2x^2-y^2=-28\)
c)\(\frac{x}{2}=\frac{y}{4}=\frac{z}{6}v\text{à}x^2+y^2+z^2=14\)
d)\(x:y:z=3:4:5v\text{à}5z^2-2y^2=594\)
Bài 1. Tìm ba số x, y, z, t biết:
\(\text{x : y : z : t 2 : 3: 4 : 5 & x+ y +z+ t =4}\)
\(\frac{x}{2}=\frac{y}{3};\frac{y}{5}=\frac{z}{4}\text{& x -y+ z 49}\)
Cần gấp
\(\frac{x-y}{3}=\frac{x+y}{13}=\frac{x.y}{200}\)
cho các số x,y,z khác 0 va thoả mãn :\(\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=0.t\text{ính}gi\text{á}tr\text{ị}bi\text{ểu}th\text{ức}P=\frac{y+z}{x}+\frac{z+x}{y}+\frac{x+y}{z}\)