题目内容
若
=
=
,则
=
.
x |
2 |
y |
3 |
z |
4 |
x-y+3z |
3x-y |
11 |
3 |
11 |
3 |
分析:先设
=
=
=k,则x=2k,y=3k,z=4k,再把x、y、z的值整体代入计算即可.
x |
2 |
y |
3 |
z |
4 |
解答:解:设
=
=
=k,则
x=2k,y=3k,z=4k,
即
=
=
,
故答案是
.
x |
2 |
y |
3 |
z |
4 |
x=2k,y=3k,z=4k,
即
x-y+3z |
3x-y |
2k-3k+3×4k |
3×2k-3k |
11 |
3 |
故答案是
11 |
3 |
点评:本题考查了比例的性质,解题的关键是设比值为k.
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