Tìm x,y biết
\(\frac{1+3y}{12}=\frac{1+6y}{2x}=\frac{1+9y}{5x}\)
tính x,y biết: \(\frac{1+3y}{12}\)=\(\frac{1+6y}{2x}\)=\(\frac{1+9y}{5x}\)
mk giải rồi nhưng hơi dài,kết quả thôi nha
x=-12
y=\(-\frac{1}{4}\)
tìm x,y biet:
\(\frac{1+3y}{12}\)=\(\frac{1+6y}{2x}\)=\(\frac{1+9y}{5x}\)
tìm x , y , z biết
a,
\(\frac{x+y}{x}=\frac{y}{x+z}=\frac{z}{x+y}=x+y+z\)
b,
\(\frac{2x+1}{5}=\frac{3y-2}{7}=\frac{2x+3y-1}{6x}\)
c,
\(\frac{1+3y}{12}=\frac{1+6y}{2x}=\frac{1+9y}{5x}\)
d,
\(\frac{y+z+1}{x}=\frac{z+x+2}{y}=\frac{x+y-3}{z}=\frac{1}{x+y+z}\)
Tìm x,y, biết
\(\frac{1+3y}{12}=\frac{1+6y}{16}=\frac{1+9y}{4x}\)
Ta có : \(\frac{1+3y}{12}=\frac{1+6y}{16}=\frac{1+9y}{4x}\)
\(\Rightarrow\frac{1+3y}{12}=\frac{1+9y}{4x}=\frac{1+3y+1+9y}{12+4x}=\frac{2+12y}{12+4x}\)
\(\Rightarrow\frac{1+6y}{16}=\frac{2.\left(1+6y\right)}{12+4x}\)
Do đó : \(16=\frac{12+4x}{2}\)
Từ đó suy ra : x = 5
Tìm x,y biết:\(\frac{1+3y}{15+x}=\frac{1+6y}{18}=\frac{1+9y}{9x}\)
Tìm x,y biết rằng\(\frac{1+3y}{15+x}=\frac{1+6y}{18}=\frac{1+9y}{9x}\)
đề có đúng như z ko bn:
ta có: \(\frac{1+3y}{15}=\frac{1+6y}{18}\)
\(\Rightarrow\left(1+3y\right).18=\left(1+6y\right).15\)
\(18+54y=15+90y\)
\(54y-90y=15-18\)
\(-36y=-3\)
\(y=-3:-36\)
\(y=\frac{1}{12}\)
ta có: \(\frac{1+6y}{18}=\frac{1+9y}{9x}\)
\(\Leftrightarrow\left(1+6y\right).9x=\left(1+9y\right).18\)
\(9x+54xy=18+162y\)
thay số: \(9x+54.\frac{1}{12}x=18+162.\frac{1}{12}\)
\(9x+\frac{9}{2}x=18+\frac{27}{2}\)
\(x.\left(\frac{9}{2}+9\right)=31\frac{1}{2}\)
\(x.13\frac{1}{2}=31\frac{1}{2}\)
\(x=31\frac{1}{2}:13\frac{1}{2}\)
\(x=45\)
KL: x =45 ; y= 1/12
CHÚC BN HỌC TỐT!!!!
Tìm x, y, z biết:
(1+3y)/12 = (1+6y)/2x = (1+9y)/5x
tìm x
\(\frac{1+3y}{12}=\frac{1+6y}{16}=\frac{1+9y}{4x}\)
Tìm x:
\(\frac{1+3y}{12}=\frac{1+6y}{16}=\frac{1+9y}{4x}\)