以下部分添加到您的sed命令（在末尾）：

Add the following part to your sed command (at the end):

-e 's/\.0*$//'

（删除一个点，然后在通过没有结束任意多个零）。

(Delete a dot followed by arbitrarily many zeroes at the end by nothing.)

顺便说一句，你***更换回声$ bil1 * $ bil2 按回声$ bil1 * $ bil2，否则你可能会根据当前目录的内容得到奇怪的效果。

By the way, you better replace echo $bil1*$bil2 by echo "$bil1*$bil2", otherwise you may get strange effects depending on the contents of the current directory.