问题 填空题
5
=2.236
,则
45
=______(精确到0.01)
答案

45
=
5×9
=3
5

5
=2.236,

∴原式=3

5
=3×2.236

=6.708

≈6.71,

故答案为6.71.

单项选择题
单项选择题