已知:x:y:z=4:3:5.求x+2y+z分之2x-y+z的值?我要》》谢谢..
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已知:x:y:z=4:3:5.求x+2y+z分之2x-y+z的值?我要》》谢谢..已知:x:y:z=4:3:5.求x+2y+z分之2x-y+z的值?我要》》谢谢..已知:x:y:z=4:3:5.求x+
已知:x:y:z=4:3:5.求x+2y+z分之2x-y+z的值?我要》》谢谢..
已知:x:y:z=4:3:5.求x+2y+z分之2x-y+z的值?我要》》谢谢..
已知:x:y:z=4:3:5.求x+2y+z分之2x-y+z的值?我要》》谢谢..
就认为x=4,y=3,z=5
所以,x+2y+z=15,2x-y+z=10,
因此,x+2y+z分之2x-y+z的值是10/15=2/3
就是把里面的转换成一个未知量,答案2/3求采纳!!!
1.5,二分之三
x=4a,y=3a,z=5a,x+2y+z=15a,2x-y+z=10a.
所以(x+2y+z)/(2x-y+z)=15a/10a=3/2
把他们带进去不就行了,这还用算吗?
x:y=3:5 => x:y=6:10y:z=2:3 => y:z=10:15x:y:z = 6:10:15设x = 6a ,则y = 10a,z =15a(x+2y+z)/(2x-y+z)=(6a+2*10a+15a)/(2*6a-10a+15a)=(6+20+15)/(12-10+15)= 41/17
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