5x+2y+z=32 ①
2x+y+3z=29 ②
4x+3y+2z=37③
②* 2-①4x+2y+6z-(5x+2y+z)= 29 x2-32。
5z-x=26
x=5z-26 ④
②*3-③ Get 3(2x+y+3z)-(4x+3y+2z)=29x3-37.
2x+7z=50 ⑤
Bring ④ to ⑤ Equation 2(5z-26)+7z=50.
z=6
x=5z-26=5x6-26
=4
Substitute x=4 z=6 into ① to get 5x4+2y+6=32.
y=3
A: Every Chinese book is 4 yuan, every math book is 3 yuan, and every natural book is 6 yuan.
If the question is wrong, the unit price of each book will not be discussed. Do you want to say "how much is each book" or "the unit price of each book?" )