已知x:y:z=2:3:5,且3x+4z-2y=40,求x
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已知x:y:z=2:3:5,且3x+4z-2y=40,求x已知x:y:z=2:3:5,且3x+4z-2y=40,求x已知x:y:z=2:3:5,且3x+4z-2y=40,求x设x=2m,y=3m,z=
已知x:y:z=2:3:5,且3x+4z-2y=40,求x
已知x:y:z=2:3:5,且3x+4z-2y=40,求x
已知x:y:z=2:3:5,且3x+4z-2y=40,求x
设x=2m,y=3m,z=5m
则6m+20m-6m=40
m=2
∴x=2m=4
因为x:y:z=2:3:5 设x=2t,y=3t,z=5t
代入3x+4z-2y=40 得
6t+20t-6t=40
t=2
即x=2t=4
设一份为a,则x=2a,y=3a,z=5a
则3*2a+4*5a-2*3a=40,得a=2
故x=4,y=6,z=10
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