问题
填空题
若2m=3,4n=8,则23m-2n+3的值是______.
答案
∵2m=3,4n=8,
∴23m-2n+3=(2m)3÷(2n)2×23,
=(2m)3÷4n×23,
=33÷8×8,
=27.
故填27.
若2m=3,4n=8,则23m-2n+3的值是______.
∵2m=3,4n=8,
∴23m-2n+3=(2m)3÷(2n)2×23,
=(2m)3÷4n×23,
=33÷8×8,
=27.
故填27.