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Math 2 plus physical answers
When two math books and two physics books are adjacent, two chemistry books can only be between them.

***A22A22A22A22= 16

When two math books are not adjacent to two physics books, two chemistry books should be placed between the math books with 1 book, and 1 book should be placed in the other four spaces, a22c 4 1a 22 = 32.

When two math books are different, there are 32 kinds when two adjacent physics books are adjacent.

When mathematics and physics are not adjacent, a22a22a52 =160 and ***240.

Methods 2a66-3a5a22+3a44a22a22-a33a22a22 = 240.