> 数学 >
x
3
=
y
4
=
z
5
,则
-x+y
x+2y+3z
=______.
人气:466 ℃ 时间:2020-03-20 09:53:14
解答
x
3
=
y
4
=
z
5
=k,
则x=3k,y=4k,z=5k,
所以
-x+y
x+2y+3z
=
-3k+4k
3k+2×4k+3×5k
=
1
26

故答案为:
1
26
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