145分之22乘39分之1乘87
=22/145×1/39×(78+9)
=22/145×1/39×78+22/145×1/39×9
=22/145×2+22/145×9/39
=22/145×(2+9/39)
=22/145×87/39
题目错了吧,我怎么又算回来了没错,你是对的哦