问题 填空题
log5
2
log79
log5
1
3
log7
34
=______.
答案

log5
2
log79
log5
1
3
log7
34
=
1
2
log52•2log73
-log53•
2
3
log
7
2
=-
3
2

故答案为:-

3
2

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