解方程组x:y=3:4 y:z=4:5 x+y+z=36

问题描述:

解方程组x:y=3:4 y:z=4:5 x+y+z=36

把x和z化为y,
X=3y/4
Z=5y/4
X+y+z=3y/4+5y/4+y=36
Y=12
X=9
Z-15