(1)已知3x=2y=z,求2x+y-z分之x-y+2z的值.(2)若(x+y):(3x-2y)=5:2,则x:y=?
问题描述:
(1)已知3x=2y=z,求2x+y-z分之x-y+2z的值.(2)若(x+y):(3x-2y)=5:2,则x:y=?
答
1设3x=2y=z=k,
x=k/3 y=k/2 z=k 代入就行了
2.2(x+y)=5(3x-2y)
13x=12y
x:y=13:12