Ta có:3x=4y=5z =>\(\frac{3x}{60}=\frac{4y}{60}=\frac{5z}{60}\)
=>\(\frac{x}{20}=\frac{y}{15}=\frac{z}{12}\)
Áp dụng tính chất của dãy tỉ số bằng nhau:
\(\frac{x}{20}=\frac{y}{15}=\frac{z}{12}=\frac{x+y+z}{20+15+12}=\frac{-94}{47}=-2\)
Từ \(\frac{x}{20}=-2=>x=-40\)
\(\frac{y}{15}=-2=>y=-30\)
\(\frac{z}{12}=-2=>z=-24\)
tim x y z biet
3x=4y=5z-3x-4y va 2x+y=z-38
Tim x,y,z biet (x-1)/2= (y+3)/4 =(z-5)/6 va 5z-3x-4y
tim x;y;z biết 3x=4y=5z va x-2y+3x=0
Tim x,y,z biet:
\(\frac{5z-6y}{4}=\frac{6x-4z}{5}=\frac{4y-5x}{6}\) va 3x-2y+5z=96
BAI 1 : Tim x;y;z biet 6x 3/5 4y 6x/7 3z 4y Va 2x 3y 5z 21
tim cac so x,y,z biet x -1 phan 2 bang y cong 3 phan 4 bang z-5 phan 6 va 5z - 5x - 4y bang 50
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!
Tim x,y,z biet x-1, y+3, z-5 voi ti le 2,4,6 va -3x - 4y + 3z = 50
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
