问题 填空题
已知5m=
1
2
,5n=3,则5m-2n=______,52m+n=______.
答案

∵5m=

1
2
,5n=3,

∴5m-2n=5m÷(5n2

=

1
2
÷32

=

1
18

52m+n=(5m2×5n

=

1
4
×3,

=

3
4

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