All the books are expensive.可不可以说 the books are all expensive

All the books...., the books are all.....是可以的，很正常的表示方法。

不过the books all are，语法上应该可以，但很少这样说。 如果all后面不是接be动词，而是实意动词的话，这样的顺序也可以。 如：

They all like playing football.

可以

当然不可以了 ，英语是有规则的，被你改了就不是这本书很贵了，不知道变什么样了

All the books are expensive.可以 the books are all expensive.

the books all are expensive. 很别扭。很少这么用。

the book is expensive.
the book = 那本书，

All books are expensive 可以

当然不行了，意思都变了啊
而且你强调的重点不同