Leeanne Carlson wanted $ 20 million for his large house with two gardens, but he _______ $ 10 million.

配平和完成下列化学方程式并在括号写出反应类型

（1）____ 　 P+____ FeO═____ P₂O₅+____ 　Fe____ 

（2）____ 　Fe（红热）+____ 　H₂O（气）═____ Fe₃O₄+____ H₂

（3）____ 　N₂+____ 　H₂═____ 　NH₃____

（4）____ Al+____ Fe₃O₄═Fe+____ Al₂O₃____．

$\cos {150}^{°}=$  (    )