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由两种元素组成的化合物统称为二元化合物。由一种元素（或原子团）与一种原子团组成的化合物，也可以看作二元化合物。通过下面的例题，可帮助同学们掌握利用通式——MxN。求解二元化合物的化学式的方法。一、根据化合价推断化学式例1已知铝元素为十3价，氧元素为一2价。请写
Compounds consisting of two elements are collectively referred to as binary compounds. A compound consisting of one element (or atom group) and one atom group can also be regarded as a binary compound. Through the following examples, you can help students master the use of general formula - MxN. The method for solving the chemical formula of the binary compound. First, chemical formulae are inferred from the valences. Example 1 is known to have aluminum at a decavalent price and oxygen at a valence of two. Please write