cho x,y,z thoa man x/2=2y/3=3z/4 va x-y=15. khi do x-y-z la
cho x,y,z thoa man \(\frac{x}{2}=\frac{2y}{3}=\frac{3z}{4}\) va x-y=15
Khi do x-y-z=.......................?
\(\frac{x}{12}=\frac{y}{9}=\frac{z}{8}\) => \(\frac{x-y}{12-9}=\frac{15}{3}=5\)=> x = 60 ; y= 45 ; z=40 => x-y-z = 60-45-40 =-25
\(\frac{x}{2}=\frac{2y}{3}=\frac{3z}{4}\Leftrightarrow\frac{x}{2}=\frac{y}{\frac{3}{2}}=\frac{z}{\frac{4}{3}}\)
Áp dụng t/c dãy tỉ số=nhau:
\(\frac{x}{2}=\frac{y}{\frac{3}{2}}=\frac{z}{\frac{4}{3}}=\frac{x-y}{2-\frac{3}{2}}=\frac{15}{\frac{1}{2}}=30\)
=>x/2=30=>x=60
y/3/2=30=>y=30.3/2=45
z/4/3=30=>z=30.4/3=40
Vậy x-y-z=60-45-40=-25
biet x;y;z thoa man: (x-1)/2 = (y-2)/3 = (z-3)/4 va x-2y+3z = -10
khi do x+y+z = ?
suy ra x-1/2+1=y-2/3+1=z-3/4+1 suy ra x+1/2=y+1/3=z+1/4 = K Ta có x=2K-1;y=3K-1;z=4k-1 mà x-2y+3z =-10
Biet x;y;z thoa man x-1/2=y-2/3=x-3/4 va x-2y+3x=-10. Khi do x+y+z =?
ba so x,y,z thoa man x-1/2=y-2/3=z-3/4 va x-2y+3z=14
x=........ y=............ z=.............
cho 3 so x;y;z thoa man 3x =2y ; 7y=5z va x+z-y =32 . khi do x+y-z= ?
ba so x;y;z thoa man 6/11x =9/2y=18/5z va x+y+z =-120
khi do x+y+z =
cho cac so x,y,z thoa man( x-1)/2=(y-2)/3=(z-3)/4 va 2x +3y-z=95 khi do x+y+z =
ai nhanh minh tich
Biết x ;y;z thỏa mãnx-1/2=y-2/3=z-3/4 va x-2y+3z=-10
Khi do x;y;z =?
Giúp mình tí
a,tim x,y,z thoa man x/10=y/15 ,x=z/2 va x+2y -3z = -24
b,cho đa thức f(x) thoả mãn điều kiện
(x- 2013).f(x) = ( x- 2014) . f(x- 2012)
Chứng minh rằng f(x) có ít nhất 2 nghiệm
a)
\(\frac{x}{10}=\frac{y}{15}=>\frac{x}{2}=\frac{y}{3}\)
\(x=\frac{z}{2}=>\frac{x}{2}=\frac{z}{4}\)
=> x/2=y/3=z/4=\(\frac{x+2y-3z}{2+4-12}=\frac{-24}{-6}=4\)
x=4x2=8
y=4x3=12
z=4x4=16