已知32m=5,3n=10,求9m-n和92m-n.
问题描述:
已知32m=5,3n=10,求9m-n和92m-n.
答
解;32m=9m=5,3n=[(3n)2]
=(9 1 2
)n=1001 2
9m-n=9m÷9n=5÷
=
10
;
10
5
92m-n=92m÷9n=25÷100=
.1 4