\(4x=2y\Rightarrow2x=y\Rightarrow\frac{x}{1}=\frac{y}{2};7y=5z\Rightarrow\frac{y}{5}=\frac{z}{7}\)
\(\frac{x}{5}=\frac{y}{10}=\frac{z}{14}=\frac{x-y+z}{5-10+14}=-\frac{46}{9}\)
\(x=5.\frac{-46}{9}=-\frac{230}{9}\)
\(y=10.\frac{-46}{9}=-\frac{460}{9}\)
\(z=14.\frac{-46}{9}=-\frac{644}{9}\)
tim x, y, z biet:
4x=3y; 7y=3z va x-y+z= -46
tim x,y,z biet 4x=3y,7y=5z va yz-2x^2=110
tim x,y,z biet
a/ x:y:z = 5:3:4 va x+2y-z =-121
b/ 5x = 2y ; 3y = 5z va x+y+z = -970
c/ x/3 = y/12 = z/5 va x.y.z = 22,5
TIM CAC SO X;Y;Z BIET : 20X = 7Y ; 8Y = 5Z VA 2X + 5Y - 2Z = 100
Tim x,y,z biet:
a, x/2=y/3; y/5=z/7 va x+y+z=138
b, 10x=15y=21z va 3x-7y+5z=30
Tim x,y,z biet
b) 2x=3y:5y=72 va 3x-7y+5z=30
c) x:y:z=4:5:6 va x2-2y2+22=18
Tim x,y,z biet: a,(3x−2y)6+(y−5z)8+|z−2|=0(3x−2y)6+(y−5z)8+|z−2|=0
b,3x−2y4=2x−4z3=y−3z23x−2y4=2x−4z3=y−3z2va x+y+z=990
Gấp gấp gấp!
Tim x,y,z biet: a,(3x−2y)6+(y−5z)8+|z−2|=0(3x−2y)6+(y−5z)8+|z−2|=0
b,3x−2y4=2x−4z3=y−3z23x−2y4=2x−4z3=y−3z2va x+y+z=990
Gấp gấp gấp!
cho 3 so x;y;z thoa man 3x =2y ; 7y=5z va x+z-y =32 . khi do x+y-z= ?
Bai 1: tim x,y,z biet rang
a,\(\frac{x}{1}\)=\(\frac{y}{2}\)=\(\frac{z}{3}\)va 4x -3y +2z =36
b,x : y: z=3 :5 :(-2) va 5x -y +3z =124
c,2x= 3y, 5y= 7z va 3x- 7y+ 5z = -30
